Computer won't start up

[Kmart1212]

Yeah. I tried booting with another PSU, but it made no difference. I'm just gonna buy a new mobo and hope for the best.

Well before you spend all that money, you can try to replace the battery on the mobo. How old is your MOBO?
How to Replace the BIOS Battery - YouTube
Directs to do it.
Power off and unplug. Press/hold power button for ~15 sec. Open the case and remove the motherboard battery. Press/hold power button again for ~30 sec and then replace it with a fresh 3-volt CR2032 lithium ion battery (right-side-up!), about $2-$3 at discount stores. From the source above.

 

[Moren0]

It just shut off? Or it doesn't turn on? did you move it? Shake it or something like that, maybe it's the them just take it out for few secs then put it back not the greatest help but might be better then saving money.

 

[TeethreeEmfor]

Its seven years old. I found they same mobo model for $30 so I just went for it.