Power button acting odd

Dureth

Dureth

Dureth

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Joined
14 Mar 2005
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2,208
Ok I've just installed a new motherboard (Gigabyte K8NMF-9) in my case (X-Qpack). However after connecting everything up the power button doesn't turn the machine on. Instead I have to hold the button in for 4 seconds then let go the n very quickly press it again. If I just hold it in for 4 seconds it doesn't do anything and if I take longer than 1/2 a second to press it again it wont turn on.

Has anybody experienced anything like this before? I've checked all the front panel connections on the motherboard and they are all right. I've checked that there arn't any short circuits anywhere. I can't figure this one out!
 
Bump for the morning crowd.

This morning turning it on wasn't as simple as following my formula of "hold for 4 seconds then a quick press". I had to try this 4-5 times before the machine would boot.
 
Have you tried shorting the pins on the mobo rather than using the switch? If so, was there any difference?

If not, do you have another PSU you can try?
 
I'll try that cheers. I do have another PSU to try, but I doubt it's this one that is the problem as it was working fine yesterday with the previous motherboard before the uprgade (same case and PSU, different mobo).
 
I've only ever had this when I was using a 230w PSU on a PC that was flaking out when heavily loaded, then I added a TV card. It was quite a while ago.
 
The PSU has plenty of power for the system, including enough on the 12v lines.

I just disconnected all the front panel leads and shorted the power switch which worked fine first time. Great I thought, the power button is on the blink. I connected the power button on its own and that also worked fine. Hmmm says I, so I connected all the front panel leads and sure enough now everything works.

Oh well, I tried reconnecting all the leads before and it did nothing, this time it worked. I hate it when something starts working and I have no idea what was wrong. On the other hand, YAY it works! :p
 
Ok update on this problem.

I've done a bit of mucking around and I've determined that it only fails to turn on after its been left off for more than a minute or so. If you turn it off then try to turn it on within a short period it works fine.

Also when it wont turn on it seems that if I hold the power button down for at least 10 seconds on the next press it will always turn on. Holding it for only 5 seconds isn't always enough. This makes me think that maybe the motherboard/PSU isn't getting the power to detect the "soft" switch of the jumper until its been charged by holding the connection open.

Any other ideas?
 
Could be a faulty button literally.

Try using a screwdriver head or something alike (non magnetic) and jump the pins. Just rules it out.
 
Garyj881 said:
Isn't there some settings in the bios to choose what the power button does?
Click to expand...

Think thats usually for the power button when the system is on.

Power button can be shutdown, standby, hibernate, etc......
 
It's not the BIOS settings, I've tried several combinations of settings in there to do with ACPI and power control but with no effect.

I'll try the screwdriver again this time after having left it for long enough to exhibit the problem as last time I used the screwdriver it was immediately after a shutdown at which time it doesn't exhibit the symptoms.

Cheers for keeping with me on this guys.
 
If using the screwdriver has the exact same symptoms, then I guess it must be PSU or mobo... so then I'd try changing the PSU. If that doesn't help, then I'd probably get talking with the mobo manufacturer :)
 
Could literally be something unseated slightly, i had power up issues like this for ages until i couldnt take no more, and i spent a good few hours testing parts etc...... in the end i noticed the power cable to the mobo wasnt quite in properly....... i felt like a right tit then because i had checked the cables 3 or 4 times already.... :rolleyes:
 
Ok I've fitted a spare PSU (enermax noisetaker 485w). It still wont work, even when shorting the pins on the motherboard so its not PSU or power button, it's the motherboard.

Think it's time to RMA to OCUK while I still can.
 
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