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Old 03-02-2010, 08:57 PM   #1
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Default No longer POSTing / no VGA signal

Hi all,
I'm trying to fix my sisters machine, which has stopped POST-ing (no post beeps, no VGA signal, but everything powers up / fans spin). The machine is just older than a year old. My sister reports that it only did it once every now and again, and it's become more and more common. I booted it up once since I've look at it but haven't been able to since.

I think I've narrowed it down to either motherboard or PSU. If I remove the RAM, the motherboard beeps constantly. I tried replacing with other RAM that I have, and the same problem occurred (so it's not the RAM). I tried removing the CMOS battery for 15-20 minutes and then replacing it, no change.

The motherboard is a cheap MSI All-in-One, and the PSU is a generic (numan) 450 watter. I have no spares for either of them, so I can't test to see which one is causing the problem. What else can I try?

Thanks
Rhys
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Old 03-02-2010, 09:11 PM   #2
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Default Re: No longer POSTing / no VGA signal

Try a different PSU or put the PSU in a different computer.
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Old 03-02-2010, 09:18 PM   #3
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Default Re: No longer POSTing / no VGA signal

As mentioned, I have no spares. I can't take the power supply out of this machine as it's fairly well tied up with cable ties and I'd prefer not ruin it if I can help it... if I had a spare power supply I would connect it and test it (just not put it in the case), but I don't.
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Old 03-02-2010, 09:27 PM   #4
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Default Re: No longer POSTing / no VGA signal

No chance you can pull one from a different computer?

Do you have a PSU tester?

Try jumping the green to black pins with a paperclip, then use a volt meter to check if the voltages are okay.
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Old 03-02-2010, 09:34 PM   #5
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Default Re: No longer POSTing / no VGA signal

Afraid I don't have any tools like that.
I only have 2 machines I can put a PSU from, but one is very difficult to pull apart, and the other is my own machine which I'm not willing to use.

I was hoping there might be some test that would make it more obvious whether the motherboard was the problem.
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Old 03-02-2010, 10:39 PM   #6
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Default Re: No longer POSTing / no VGA signal

not really.

You don't have a multimeter and a paperclip?
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Old 03-02-2010, 11:25 PM   #7
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Default Re: No longer POSTing / no VGA signal

nope
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Old 03-02-2010, 11:31 PM   #8
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Default Re: No longer POSTing / no VGA signal

Quote:
Originally Posted by RhysAndrews View Post
My sister reports that it only did it once every now and again, and it's become more and more common.
Pretty common issue when PSUs start to die. I remember my old Dell. Would do the same thing. I would turn the monitor on and find the computer off (this was years ago before I even started my computer shop). If I banged on the PSU, I could usually get it to fire. Finally it just died altogether.

It could still be something else, so I still suggest you test this theory.
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Old 03-04-2010, 09:44 PM   #9
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Default Re: No longer POSTing / no VGA signal

Thanks mate.
I've purchased a new PSU (I figured I could use it on my HTPC which has a loud, old generic PSU if it's not the problem) - connected it all up, turned it on... nothing.

Considering the motherboard beeps if memory is removed though, I don't think it's all dead. I just found someone who has a spare video card that I can try - just in case it's the onboard gfx. If not, I'll go ahead and get a new motherboard =[

Thanks guys,
Rhys
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