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Computer tries to start over and over, but can't

post #1 of 9
Thread Starter 
Today I got home and tried to wake my computer up from sleep.

It tried to wake up and I wasn't really paying attention closely, but it died and turned off, did not wake up.

Now when I try to start it, it will start for about half a second, then turn off. Waits a few seconds, tries again, exact same result. Over and over and over until I turn off the psu. If I remove the 12V atx from the mobo, it will power up normally (but obviously won't post, as the mobo isn't powered). Every single time I try to boot with the 12V atx out, it turns on fine (all fans, etc), but every single time I put in the 12V atx, it turns over for half a second, lights on mobo come on, etc, and then dies.

The psu is about 7 months old and is a corsair CMPSU-750TX 750W. The mobo is about a year old and is an ASRock X58 extreme.

This machine has been running fine for the past 7 months without me touching anything. It had originally run for 5 months before that too, but the original PSU I had, a 620W unit, died, so I bought the corsair, and it has been perfectly fine for 7 months now.

I'm thinking it's either the PSU again or the mobo? Not sure, though. I don't have another PSU to try I did check the voltage on this psu when it's on, and the 5V line is a little over 5V, 5.1V or something, and the 12V is 12.25V or so (when the 12V atx is disconnected), but this is under no load (well, lighter load). I tried to monitor the 12V line when it false starts, but my meter is auto ranging and does not range fast enough to catch it.

Since removing the 12V atx allows it to start up, the 12V line is clearly the problem. I guess the question is whether or not the mobo is drawing too much current because it is suddenly faulty, or if the mobo is fine and drawing a normal amount, but the psu cannot deliver it because it has a problem.

Any thoughts?
i7 920
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i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
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Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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i7 920
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post #2 of 9
I think it may be a short. When the board has juice it shorts, when its unpowered and unplugged the short doesn't happen and the psu starts up.
The Butthurt Box
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The Butthurt Box
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post #3 of 9
Any beep codes? Does your board have an LED display for error codes?

You took it out of the case so you're sure nothing was shorting the board?

Try with one stick of memory in slot 1. Try resetting CMOS via button/jumper.

Unplug everything, take the CMOS battery out, wait an hour and try to boot again.

And test with another PSU of course, can you borrow one?
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post #4 of 9
Get a multimeter to test your PSU, it's the only way to know for sure. Shorting the black and green wires can also tell if your PSU is still getting power but no guarantee on voltage specs without a multimeter. I'm kind of thinking it's the motherboard. Asrock is no longer owned by Asus, some of the members on this forum wouldn't touch Asrock with a 40 foot pole. Never owned an Asrock product before so I can't really say much about it.
post #5 of 9
Thread Starter 
The mobo does not beep and does not have time to show codes. The lights and code led block are on barely long enough to light up.

I thought I needed 3 sticks of RAM to boot anyway, but tried just one stick in A1, then tried a different of the 3 instead by itself, no difference.

I can't really borrow a PSU. I might pick one up to try, but only if I can return it if it's ok.

If I remove the CMOS battery, will this mess with my RAID 0 array? I really don't want to lose that data.

I have a multimeter, and I did already test my PSU (per my first post). It shows the proper voltages, but I don't have a way to load it to know for sure. As far as I can tell, the standard no load (or light load) test only tells you if it's bad, but a pass doesn't confirm it's all good?

The ASRock has been OK until now, and since I have win 7 OEM, I guess at this point I would really only be interested in an RMA or buying the same one. It is out of warranty, though.
i7 920
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i7 920
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post #6 of 9
I had this problem happen to me. I removed each part to see what it could be then ended up switching out the psu and still the same problem, it would attempt to turn on then go off. Mobo was my issue :<
Emery
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post #7 of 9
Thread Starter 
Damn, I'm still hoping it's the psu

If it's the mobo, anyone know whether or not I'll be able to save my RAID 0 data or transfer my win7 oem license to the new (same model) mobo?
i7 920
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i7 920
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i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
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Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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post #8 of 9
Thread Starter 
Just cleared the CMOS and it did not help. I followed the instructions in the manual, unplugged from the wall, moved the jumper for 10 seconds (manual said 5), replaced it, tried it, same exact problem.
i7 920
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i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
Hard DriveOSPowerCase
Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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i7 920
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i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
Hard DriveOSPowerCase
Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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post #9 of 9
Thread Starter 
I know it's been a while, but I wanted to follow up on this problem for everyone's future reference.

The problem in my case was the motherboard.

I basically knew it was either the mobo or psu. Since the psu passed all the normal tests, I decided to stress test it using a 1 ohm 225w resistor I had, which pulled ~12 amps off the 12V ATX line at the same connector the mobo was having trouble. I dunno if this was representative of the amount of power the mobo normally draws, but I figured it was probably in the ballpark of what it could possibly draw. So, with this resistor in place, everything fired right up normally (not the mobo though, obviously, since it did not have the 12V ATX power, which was going into the resistor instead). The resistor heated up, proving that it was getting power properly. I deduced that if the psu could happily provide 12A to the resistor, that it was probably not the problem, and that it had to be the mobo.

I was, of course, about 4 months out of warranty from ASRock, and since I have OEM win7 ultimate, and don't want to buy it again, I just ordered the same mobo again. It's not terribly expensive anyway. I just finished installing it (been really busy and finally got around to it), and it fired right up and seems to be working fine. So, it was the motherboard in my case. I'll probably still send the old board back for repair, so that I'll have it as a backup, and so that hopefully ASRock can learn from the problem and make better boards in the future :shrug:

Just for reference as well... I did/do have a RAID 0 array on this machine, that I was worried about, but I plugged the hdds into the exact same ports on the new board, enabled RAID in the BIOS on first boot, and it recognized the array and all of my data seems fine. Also for reference, windows booted normally and everything is just as I left it before it had died.

One final thing for reference... I had pretty much ALWAYS used sleep mode on this computer for the entire 16 months it ran without issue. Every day, every time I was done with it. Never shut it down, never really left it running, always sleep mode. And waking up out of sleep mode is when it took a dump, so I'm not sure, but perhaps it had something to do with using sleep mode and this mobo, I don't know, but I wanted to mention it for anyone looking at this mobo or manufacturer in the future -- perhaps they have a problem with sleep mode and/or just firing up the mobo over and over and over (ie maybe shutting down every day would also be bad for this mobo?) Maybe the best bet is to never shut down. Who knows. I haven't decided what I'm going to do with the new board now, but I'm pretty much planning on just using sleep still.

Anyway, that about sums it up. Thanks for the help and suggestions... hope this helps someone in the future.
i7 920
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CPUMotherboardGraphicsRAM
i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
Hard DriveOSPowerCase
Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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i7 920
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 (No OC) ASRock x58 extreme Asus 4890 HD OCZ Platinum DDR3 1600 (3x2gb) 
Hard DriveOSPowerCase
Intel x25-m 80gb (G1) Windows 7 RC (7100) Corsair CMPSU-750TX 750W Antec SX1000 
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