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Old 06-28-2017, 04:14 AM   #1
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Default Computer Not Booting

Right so keep it as short as I can my computer isn't Booting.

Recently bought a new Corsair PSU, installed fine and computer Booting and running perfectly for a couple weeks. No problem.

The point I noticed trouble Booting was when I flashed my GPU incorrectly.. and had to swap the GPUs around, etc. So I could unbrick it... half way through that process... I noticed it refused to boot.

Reset the CMOS and it started Booting just fine... but now every time I turned the computer off I'd need to reset the CMOS every time.

However now when I reset CMOS it's not Booting at all. I can see there's power as the ethernet light is on.

Any suggestions at all??

Edit: Just trying the power button now and it very very briefly turns on and quickly turns off? Is it being shorted somewhere? Where's the best place to check?
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Old 06-28-2017, 05:53 AM   #2
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Default Re: Computer Not Booting

Best thing to do when troubleshooting this kind of issue is to immediately strip your machine of everything that it doesn't need to boot.

Namely, remove all GPUs (utilise on-board video if you have it), all hard drives other than your boot drive, all USB devices except mouse and keyboard (and try and use a basic mouse and keyboard if you can, rather than one with funky passthroughs or LEDS or whatever), and all but one stick of RAM.

Now you've done that, you've got a bare minimum of stuff required to boot. See if it turns on, if it does, one of the parts you've removed is faulty, you can add things back one at a time until it stops booting again, that way you know the last thing you added is the problem.

If you remove everything surplus to bare minimum and it still won't boot, try unplugging your CPU EPS power plug (the 4 or 8 pin power plug that you plug in near your CPU socket). If you remove this power plug and the system now boots, your CPU power delivery is faulty (motherboard), or your CPU has been fried.

If you've still not managed to get it to power on, try another power supply. Faulty power units do happen, and it is possible for you to buy one, have it work fine and then a few days later just stop working. Bad input power, dodgy caps or manufacturing defects are all likely causes.
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Old 06-28-2017, 06:12 AM   #3
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Default Re: Computer Not Booting

Many thanks. I'very brought it into a separate room.. so no keyboard... mouse, etc.. only external connector is the power supply.

So when you say strip I assume not only disconnecting from the motherboard, but also the power connectors?
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Old 06-28-2017, 06:58 AM   #4
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Default Re: Computer Not Booting

Update:

So I tried disconnecting almost everything (bar some fans) and still the same.

I decided to try my old PSU (which I tested on another computer and it works) and exactly the same thing happens. So that rules out the PSU right?

I also tried disconnecting the 8 pin 12v connector next to the CPU .. still the same thing.. so that potentially rules out the CPU too? I even removed all RAM and still the same result..

So is it the motherboard?

I hold down the power button and it just keeps powering on for half a second then off, repeatedly.
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Old 06-28-2017, 07:16 AM   #5
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Default Re: Computer Not Booting

Further update:

Decided to completely remove the motherboard from the case entirely.

So it's just the motherboard, CPU, RAM .. power supply (old one) .. connect the 24 pin and 12v .. same thing.. powers briefly on and then shuts off again. Even tried removing the CPU 12v connector.. same thing.

Think it's the motherboard?
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Old 06-28-2017, 08:01 AM   #6
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Default Re: Computer Not Booting

Quote:
Originally Posted by datkins91 View Post
Further update:

Decided to completely remove the motherboard from the case entirely.

So it's just the motherboard, CPU, RAM .. power supply (old one) .. connect the 24 pin and 12v .. same thing.. powers briefly on and then shuts off again. Even tried removing the CPU 12v connector.. same thing.

Think it's the motherboard?
Unfortunately it sounds like you've been pretty thorough. RAM won't usually stop a machine powering on even if it's faulty - it will just halt the system at POST (fans and power on, just no display output).

If you've plugged both PSUs you've got into the motherboard both with and without the 12V power to the CPU connected, that rules out pretty much everything other than the board in my opnion.

It's a good plan when you're doing stuff like this to get it out of the case and onto a test bed of some kind like you seem to have done - I use a GPU box as cardboard is soft and non-conductive! This is a good idea as dodgy standoffs and bits of crap fallen behind the mobo tray can short connections out.


Once you've got down to this level of troubleshooting; the last test so to speak is to disconnect everything from the board other than CPU power and Mobo 24 pin power and a single fan on a fan header... power on and see if the fan keeps spinning. If it does, you're good, if it doesn't try taking the CPU power off again... if it doesn't keep the fan spinning with just the Mobo 24-pin plugged into the board, it's pretty likely unfortunately that it's a gonner
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Old 06-28-2017, 08:11 AM   #7
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Default Re: Computer Not Booting

Do you have an old motherboard lying around that you could snatch the CMOS battery out of and use it to test in your current board? It is a longshot but I have had a dying/dead CMOS battery cause some wind things over the years.
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Old 06-28-2017, 08:45 AM   #8
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Default Re: Computer Not Booting

I tried putting in a new CMOS battery.. still the same!

I think it's a pretty good indication also it's the board given that it started playing up with having to reset CMOS each time.. and now nothing, wouldn't you say?

Thankfully for Prime I have a cheap board on its way within the next hour or so haha! Far too impatient to wait any longer! So fingers crossed it will work after this..
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Old 06-28-2017, 02:51 PM   #9
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Default Re: Computer Not Booting

Have you tried everything here?

Tom'shardware guide to troubleshoot computer that won't boot
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Old 06-28-2017, 04:07 PM   #10
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Default Re: Computer Not Booting

I'm happy to report I'm currently writing this from my computer.

It was indeed the motherboard!

A friend had a brand new MSI 970 Gaming motherboard (an upgrade for sure!) and was very unfortunate.. (cancelled the Amazon orders).

From 9am I've been flandering around and it's paid off in the end. Definitely goes to show it's worthwhile over those who'd simply just replace the entire computer!

Thanks guys, once again
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Old 06-28-2017, 05:12 PM   #11
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Default Re: Computer Not Booting

Funny, your motherboard crapped on you while you were in the middle of swapping parts.

Makes you wonder.
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Old 06-29-2017, 01:16 AM   #12
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Default Re: Computer Not Booting

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Funny, your motherboard crapped on you while you were in the middle of swapping parts.

Makes you wonder.
Well the things is.. I think it may have been to do with me Overclocking and stressing the motherboard.. as it isn't the best board for Overclocking. I'd been trying to overclock my GPUs voltage which every program wouldn't allow except one outdated Sapphire Trixx.. (for some reason).. any change in voltage caused screen flickering and then a crash. On top of the fact I incorrectly bricked one of them.. so it definitely has something to do with me messing around! Lesson learnt
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Old 06-29-2017, 04:58 AM   #13
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Default Re: Computer Not Booting

Well, this is just speculation but:-

GPUs do draw some power through the PCI-E socket. Obviously, they also get most of their power directly from the PSU; but they do take 60-75W through the PCI-E socket.

Once you allow a program (any program) to have a level of control over your GPU's core voltage, all bets are off really as to what damage can be done to any component that is connected to that GPU. The reason I only use Afterburner for overclocking is because I have at least some level of trust for it!

The other thing is to understand how PCs 'start up' - essentially when you press the power button there is a voltage 'spike' to wake stuff up, before it comes down to the correct level for operation.

Anyway, all that in mind - I'd theorise that one of two things happened:-

1. Whilst working in the case, something got a static shock.
2. When your GPU BIOS went funny or when you were adjusting vcore in trixx and rebooted, the 'wake up' voltage spike (which usually comes through the mobo if i'm not very much mistaken) was too high for the PCI-E slot to handle and it overloaded mobo power delivery.
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Old 06-29-2017, 05:39 AM   #14
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Default Re: Computer Not Booting

I have a feeling you're right about the PICE slot... as when I bricked one of the GPUS .. the GPU BIOS was designed for a higher voltage I believe... and that's probably what screwed it over!
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Old 06-29-2017, 05:57 AM   #15
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Default Re: Computer Not Booting

My guess is a electrostatic discharge. The components can take a lot of voltage, so unless you really went too far, the spike wouldn't have killed it. On the other hand, electrostatic discharges can have a lot of voltage (I'm not sure how much exactlybut it was in the range of thousands).

The voltage spike is also a problem when overclocking the CPU. Some motherboards shut down and turn on after applying some BIOS settings, so if you go too far with the voltage you'll just fry the CPU, or the board, so look out for that.
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Old 06-29-2017, 07:51 AM   #16
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My guess is a electrostatic discharge. The components can take a lot of voltage, so unless you really went too far, the spike wouldn't have killed it. On the other hand, electrostatic discharges can have a lot of voltage (I'm not sure how much exactlybut it was in the range of thousands).

The voltage spike is also a problem when overclocking the CPU. Some motherboards shut down and turn on after applying some BIOS settings, so if you go too far with the voltage you'll just fry the CPU, or the board, so look out for that.
GPU die can take a buttload of voltage, but if the initial 'spike' required to turn the GPU on was too high for the PCI-E slot to handle it could in theory damage mobo power delivery. Depends on how robust the motherboard's mosfets are really, obviously CPU power delivery tends to be beefed up to all hell for supporting CPUs with beefy TDPs, but the PCI-E slots are only intended to handle a wattage of something like 70W before it hits a limiter and the PSU has to drive any additional power the card wants.

I'm no engineer, but i've not seen ESD kill a board so outright so quickly, I've seen it stop machines POSTing because of DRAM death or the like, but not fully bricked power delivery

This theory is born of watching one of my fav techtubers accidentally murder a CPU by rebooting it with the Vcore set to around 1.6v - the 'spike' above the running level to turn it on totally cooked it.
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Old 06-29-2017, 09:11 AM   #17
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Originally Posted by ~Darkseeker~ View Post
GPU die can take a buttload of voltage, but if the initial 'spike' required to turn the GPU on was too high for the PCI-E slot to handle it could in theory damage mobo power delivery. Depends on how robust the motherboard's mosfets are really, obviously CPU power delivery tends to be beefed up to all hell for supporting CPUs with beefy TDPs, but the PCI-E slots are only intended to handle a wattage of something like 70W before it hits a limiter and the PSU has to drive any additional power the card wants.

I'm no engineer, but i've not seen ESD kill a board so outright so quickly, I've seen it stop machines POSTing because of DRAM death or the like, but not fully bricked power delivery

This theory is born of watching one of my fav techtubers accidentally murder a CPU by rebooting it with the Vcore set to around 1.6v - the 'spike' above the running level to turn it on totally cooked it.
Was it by any chance Jayztwocents overclocking his 8320 and beating the 7100?

Since pcie slots are designed for low power, and they have a power limit, current will be low no matter the voltage, so burning stuff would be very hard. Now CPUs sockets, as you said, are prepared to go the extra mile, meaning power caps at pretty high levels, so current can get high.

I'm no computer/electronic engineer either, but I know resistances and transistors can handle voltage as long as currents stay withing expected levels, but not that much heat.

Now this is probably all crap, but don't leave

If the power is limited to 70w, then you'd have xV.yI=70W, so the voltage(x) raising a couple of mV won't cause a huge variation current(i)-wise. If the power is not limited, then I'm not sure.
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Old 06-29-2017, 11:01 AM   #18
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Default Re: Computer Not Booting

Gold wires can melt if too high.
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Old 06-29-2017, 11:11 AM   #19
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Gold wires can melt if too high.
Metal can melt? That doesn't sound right!
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Old 06-29-2017, 11:55 AM   #20
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I don't know if that sarcasm or not.

My point is the gold wires are microscopic and that it doesn't take much to break connections.
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