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No Post/No Bleep - CPU or Motherboard?

post #1 of 16
Thread Starter 
Hey all,

I'm not sure if this is in the right section but i couldn't find a more fitting section. I'll get on with my question.

My PC froze loading a game(Cod4 if it helps) and i had to reset the PC, But upon the reset the problems continue. The PC would freeze doing nothing, Just on the desktop, Or web browsing, And ofcause in games. The freezing would happen around 5mins upon turning the PC on and the only way out of it would be to reset the PC. The problems got worse and sometimes it wouldn't get past loading windows. Now the PC has no display on screen, No bleeps, No BIOS, Nothing, The fans spin though.

Since i don't get no display, I have replaced all my essential components but the MoBo and CPU;
I replaced my old ATI HD4890 with a 5830, No change.
I replaced my PSU 550W with a 1000W, No change.
I replaced all my RAM, tried my friends, Tried just 1 stick, No change.

My spec atm is;
Motherboard - P5N-E SLI
Powersupply - 1000w(New)
Graphics card - ATI HD5830(New)
CPU - Intel Quad Core Q6600(Not overclocked at all)
RAM - 3gb(3x1gb sticks)

I have tried various fixes, I reseated the EZ Selector card(Incase of a loose connection) I have reset the bios, Took the BIOS battery out for 15mins and put it back in. I know it's not my monitor because i connect my laptop up to the monitor reguarly.

Any more ideas on fixes, Opinions, Or how i can narrow it down to either the CPU or MoBo would be greatly appreciated,

Update - I have just left the PC on for 30mins, The heatsink on the CPU is cold, Maybe indicating the CPU is the problem?

Busta
Edited by Bustajam - 8/14/10 at 7:26am
post #2 of 16
Hmm, could be the CPU or the motherboard. Have you checked if any connections are loose?
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post #3 of 16
Thread Starter 
I've pretty much completely rewired my computer to check if theres any loose connections, Everything is connected securely. I've reseated the CPU for pot luck that it might fix it.

Thanks for the suggestion anyway, Any other ideas?
post #4 of 16
Corrupted Boot Sector of the motherboard.
If it is the CPU, fans shouldn't even spin, the motherboard wouldn't even power up the fans, probably only for a few seconds.

But if you don't have another motherboard to try, I can't guarantee it is the motherboard, but as of thus far, seems feasible.
    
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post #5 of 16
Thread Starter 
But the CPU fan isn't a part of the CPU? it uses a seperate connector? Why would the fan not spin if the CPU is dead? I'm not saying you're wrong, I just don't understand.

Would the motherboard have caused the crash that started the problems in the first place? I really hope it is the motherboard because it's so much cheaper lol
post #6 of 16
You even have the 4/8 pin connector from the PSU to the motherboard, right?

Was your CPU overclocked? I'm not sure if those are the symptoms, but I know it is possible freeze upon overclocking through BIOS.
    
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post #7 of 16
Thread Starter 
Aye ofcause, And no my CPU was not overclocked.

I don't know if this adds to the aid of fixing the problem, But holding down the power button does not turn the pc off like it should, If i'm not corrected, Holding the power button down while in bios should turn the computer off after 1second, And 7seconds once windows is loaded, The power button does nothing once the pc is turned on.
post #8 of 16
Is there any particular setting in your BIOS that controls the power switch? Sometimes it can be set to a click and it will turn off on it's own.
    
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post #9 of 16
Yeah, I don't see why a faulty CPU would prevent the fans from working. But I'd put my money on the board being at fault here. My 780i had the same issue, where it got worse over the space of a day or two until it just wouldn't post any more. The fault turned out to be a bad BIOS chip.
Since you've tried nearly everything else, see what happens if you try to boot without your graphics card. Also, re-seat the BIOS chip itself - don't actually remove it unless you've got the tools to do that and you're comfortable to do it, but just push it down wiggle it a little to see if it moves. When I did that, I managed to get it to POST but the whole board died again the next day so it had to be RMA'd.

The best test would be to eliminate one - the motherboard or the CPU. If you've got a spare 775 board or cpu (or have a friend who's willing to let you swap parts for testing purposes) swap one of them out.
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post #10 of 16
Thread Starter 
There is an option to turn on from the keyboard/Mouse, But there is no keyboard/mouse plugged in atm. I was thinking that the power switch not functioning how it should might indicate a damage motherboard?
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