Won't turn on

My computer wont turn on. D:
I press the button, nothing happens. Sometimes, it lights up, but shuts down again immediatly. Is it the powersupply?

HLEP ME D:

Anything could have gone wrong.  Considering that it doesn't turn on at all, it may be the power supply, it may be the circuit connecting the power on switch to the power supply.

try changing the cpu...

Roger. Keep them suggestions coming!

To elaborate some more, I'll add that the computer suddenly shut itself down. It did this last week too, but then I managed to turn it on again, somehow. (Basically just removing the cable and setting it in again)
Now this won't work.

Power supply.  Overheating?

My system shut off unexpectedly one day.  I could turn it back on, but anytime within two seconds and two minutes, it would shut off.  Turns out, my power supply was a switching power supply, and one of the capacitors blew.  Case in point, don't buy or use shitty PSUs on systems you give a fuck about.

1. the power suply is fucked, this is the most likely. i used to have this happen ALOT with $15 power suplies in the pentium II days
2. mobo is fucked
3. try taking all of the pci cards out, and unplugging every cable besides power to the motherboard, then try it, does it turn on?

if 3 works, do the old trial and error method of plugging stuff back in one at a time, then you know whats shortint out

PEBKAC

>>8

You forgot:

4.  CPU Fan is dead and the system is automatically shutting itself off to prevent damage to the chip.  I had this one with the shiatty fan that shipped with my 1900+.

>>1

Does your cpu fan spin freely?  If not, the bearings may be shot.  This is good news for you b/c that's a quick&easy $10-$30 fix.

>>10
if its been cooling off for a while, it will run for 5 or 10 minutes without the fan running, it wouldnt instantly shut off.

it would also beep a few times, and show the bios message "cpu fan failure" or "cpu fan rpm too low" on any motherboard new enough to check for this

>>11

Not necessarily.  As I said, I've had this happen before.  On my motherboard, the shut-off isn't related to CPU temp, it's related to the fan RPMs.  If the CPU fan doesn't ramp up its RPMs within a fraction of a second, the computer instantly shuts itself off.  Remember that we're talking about an AthlonXP which will cook itself into brokenness if uncooled for 2-5 *seconds*.  Now, granted, the fan doesn't invalidate the heat sink that it's sitting over, but killing the power based on fan RPMs instead of temperature makes sense in that case.

(I'm running a Soyo K7V Dragon+ (http//www.soyousa.com/...
for what it's worth.  A pretty solid mobo choice for the time I put this machine together.)

>>12

Oh, and lose the closing paren on that pasted url if you want it to work.