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Sudden shutdown now no boot :( - Page 4

post #31 of 47
Its either the PSU or mobo/cpu.
When you plug the PSU to your computer. your computer will put higher load on the PSU. 8800 GT+CPU+mobo will still draw more power than 2 fans and two DVD-roms. so it is still one of the suspects of this problem.
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post #32 of 47
Thread Starter 
I think you may be right on the PSU. Just tried starting up with everything disconnected (only things plugged in are the 24-pin and 8-pin CPU). It will come on for a second then shut down, then continuously repeat that cycle until I unplug the PSU.
post #33 of 47
I would put down GOOD money on the PSU, CPUs RARELY fail and I know asus is a really good brand and they dont usually go out unless under severe overclocking and yours doesnt seem to be...

Just my thought, and these symptoms were all the symptoms of my friends system...
 
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post #34 of 47
Unfortunately I think its your mobo, Same exact thing happened to me, turns on for half a second and turns off. I took everything out ran with minimal components, set mobo on box and still had the same problem.

Was indeed a dead motherboard.
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post #35 of 47
Thread Starter 
So it looks like half think its the mobo, half think PSU... Guess this gonna be a Russian Roulette decision....
post #36 of 47
Quote:
Originally Posted by vtecjunkie81 View Post
So it looks like half think its the mobo, half think PSU... Guess this gonna be a Russian Roulette decision....
motherboard/psu combo?
    
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post #37 of 47
Thread Starter 
Quote:
Originally Posted by banging34hzs View Post
motherboard/psu combo?
I don't understand the question. Are you saying it could be both? Or are you suggesting I find a combo deal?
post #38 of 47
Thread Starter 
Ok so i was finally able to test the psu with a multimeter and all the volatages checked out ok. However i cannot test the amperages since the multimeter can only go up to 20 amps. Is there a way to test the psu with a load on it so i can check the voltages under a loaded condition?

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post #39 of 47
A failed Mobo would either

A) Not boot, fans just turn on but nothing happens

B) Boots for abit, but crashes, but the power does not turn off, it just resets the machine

A overheating comp will

A) Freeze

B) Restart over and over, but it would not lose power

C) Shut down and -REMAIN- off, it will not try to restart the machine

A failing power supply will

A) Refuse to turn on under load

B) Will turn the computer on and off and on and off because the mobo is not getting enough power/enough voltage, so it keeps cold booting the computer

C) Fails to turn on period
Edited by ShamisOMally - 7/19/11 at 11:07pm
post #40 of 47
Before you spend money you don't have I suggest you reseat the CPU HSF cleaning the processor and the contact surface of the HSF.
It's a long shot but I had the same problem as you've described and that was the cause. It can happen without warning and is not easy to find.
Good luck.
Hugger
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