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Computer does not boot unless CMOS reset

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allen5055

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Hi, I have a Gigabyte GAZ87 OC Force (socket 1150 Haswell i7-4770k). I have had this motherboard for almost three years. It does not boot anymore unless I press the reset CMOS button. The fans do not spin, the case lights don't turn on, and it doesn't boot. This problem began happening a month ago, and I would get it to boot by unplugging it and eventually it would turn on after I hit the power button. It began happening almost every day during the last week, and as of today, I could only get it to turn on by pressing the reset CMOS button a few times. The power supply is fine - I can actually see a power button on the motherboard lit at all times, it just doesn't turn on anymore unless I press the reset CMOS button. When the computer is already on there are no problems.

I've tried the following with no success:
Pressing the power button or reset button multiple times (both on the case, and a power/reset button directly on my motherboard)
Switching wall outlets.
Buying a new CMOS battery
Flashing bios


Any suggestions? I suspect I'll have to get it warranty replaced.
 
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It's the PSU In my opinion. If not that, a capacitor has gone bad on the mobo.
 
That doesn't sound like the motherboard to you? I press the reset CMOS and it turns on? How would that be the PSU. Also, the motherboard power light is always on when it's plugged in.
 
allen5055 said:
That doesn't sound like the motherboard to you? I press the reset CMOS and it turns on? How would that be the PSU. Also, the motherboard power light is always on when it's plugged in.
Click to expand...

It was my second choice. A capacitor on the motherboard.
 
Power supplies can do weird things.Take it to a computer repair shop and have it checked out.Most shops will not charge you .
 
I'll try another psu before I go through all the work of a rma for the motherboard
 
Is there an older version of the bios you can flashback to? I'd try loading that, then booting into bios and loading defaults. It probably won't do anything but it's worth a shot.

BTW: Once you do manage to get it started up, everything works fine or no?
 
i had the same problem, it was one of my hard drives causing the problem. I unplugged all but my primary drive and it booted up fine, plugged them back in one by one till i found the one that caused the computer to hang up.
 
For some reason the last 2 days my computer just decided to start working again. I already bought a power supply too.
 
The computer started not booting again, I changed the poiwer supply on Tuesday and it's worked fine ever since. I guess maybe strangely it was the power supply. I don't know why resetting CMOS would fix the PSU.
 
I know I was wrong about the PSU, and am probably wrong about the mobo, but I'll bite once more for your sake - what memory settings do you have set by the BIOS by default? does it use the XMP memory profile or some other form of aggresive frequency/timings?
If it does some kind of performance increase for the memory subsystem by default, it may be doing so erratically and the memory can't cut the cheese.
 
If it still happens with the new PSU, I think it's just your heatsink that may be lose and needs tightening up.

I've had a mate that did his own build and he brought it to me to check and had exactly the same issue as yours. Even if we don't reset the CMOS, if we gave it an hour or so, it would be again. Yes we had the time, we were drinking while trying to fix a computer. So I thought I would wiggle every attachable part and I found that the heatsink was loose and tightened it up. Never happened again, and it's been over a year now.
 
Sounds like a electrical grounding problem. I know corroded or loose ground wires in car engines can cause all kinds of intermittent behavior.

Maybe try reflashing the bios.
 
I still have not had a problem turning the computer on since PSU swap. Working great. Going to RMA the old one.
 
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