PC not going into POST [Sometimes it does and works fine]

Hello,
2 days ago, my computer suddenly decided to go Haywire! I turned it off in the night, then in the morning it just wouldn't POST, The computer switches on, all lights on the mobo glow, the CPU fan is on. I immediately reseated everything and it seemed to fix the problem.
Few hours later switched it off, switched it on again, no POST!

tinkered with the RAM for a while restarted a number of times, nothing. Then I removed the CMOS battery and it worked, used it for a while, turned it off, slept, today, nothing works. The computer switches on, all lights on the mobo glow, the CPU is on. Even my Xbox 360 controller gets power initially and then turns off. Thereafter the cpu fan just hums along, the system doesn't boot.

I have to use this thing for just 3 more days and then it will probably be collecting dust somewhere so I don't wanna spend a lot of money on it, however, the fact that it turns on and runs flawlessly sometimes tells me that nothing can be terribly wrong.

Heres the basic config
Mobo : P55-GD65
Ram : 4 gig corsair 1333 Mhzz (2*2)
PSU : 550V corsair
Processor : i5 (I forget the clock freq)
Graphics : MSI twin frozr , Nvidia GTX 275
7 answers Last reply
More about post sometimes works fine
  1. What did you do when you turned it off? Or what happend when you first turned it off. I wouldnt advise removing the battery as it controls more than the CMOS in some motherboards, just use the CMOS jumpers.
  2. JefferyD90 said:
    What did you do when you turned it off? Or what happend when you first turned it off. I wouldnt advise removing the battery as it controls more than the CMOS in some motherboards, just use the CMOS jumpers.



    I didn't really turn it off in any weird way, just a normal shutdown.

    Nothing really happened other than it just stopped turning on, the CPU fan keeps going nuts along with my card, but the computer just doesn't start.
    I reseated everything yesterday, still no effect.

    I did flash the CMOS using the jumper, nothing :P
  3. so wait have you unplugged the power to the computer?

    also if you plug that back in does the problem persist or is everything quiet and too me it sounds like a mobo problem you should either go to where you bought it and get it tested or get it replaced if it is still under warranty.

    I don't think that it is a psu problem because the fans are spinning.

    Hope this helps. also try reputting everything in the mobo so take the card out and put it back in.
  4. It sounds like a motherboard... But Im still not sure, its not a normal problem... And the fans are they going at 100% speed or do they do just like normal?
  5. well he says there going like crazy so would would guess it is a mobo problem because the power is powering them just the system is not controlling how much current it going to them.
  6. Crazy could mean up down up down, or just different than usual.
  7. yeah have you tried testing your psu?

    http://www.youtube.com/watch?v=5FWXgQSokF4
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