Computer occasionally won't turn on unless CMOS is removed or discharged by holding the power button.

Martin_Guy

Reputable
Nov 17, 2015
2
0
4,510
Hello guys.
My girlfriend's custom built PC is acting up since we've moved into an apartment. So basically one day her PC would not turn on and through extensive research and testing the PSU (which by the way is working fine 100%) I managed to turn it on by removing the CMOS battery, connecting it to power and pressing the power button and it would turn on. I then would turn the PC back off and reinsert the CMOS battery. It would then boot normally for a few days - up to a week even and then the same issue. Simply discharging the static (?) charge of the battery by switching the CMOS reset plug between the three pins didnt seem to do the trich. Recently discovered if I shorted two of the CMOS reset pins with my screwdriver the PC would boot up (right away without pressing the power button) about 9/10 times.
Last time I went through the process of taking the CMOS out and back in... I forgot the "back in" part (since ASROCK Z97 Anniversary requires you to remove the GPU to get to the CMOS). I didn't want to go through the trouble of putting it back in and the PC seemed to boot just fine except for the notification on boot about BIOS and date not being set every time the PC was booted(press F1 to continue). Today the PC didn't turn on right away for the first time the CMOS was removed completely (it's been about a week and a half) and I turned it on by switching off the PSU, holding the power button for a few seconds, switching the PSU back on and the PC would start.
As you can tell I am able to boot up the PC - it just takes a lot of effort!

We didn't have this problem while living in dorms for about 4 months but turned up when we moved into an apartment. The big difference is that each night since living in an apartment we unplug the extension cords out PCs are connected to in order to save power and not crawl to the PSU switches. We didnt do this in dorms since we didnt have an electricity bill.

My ASUS 87M doesn't have this issue at all. We have tried switching the CMOS batteries and mine still works fine with her's and her PC still has the issue with mine. We also tried switching power sockets of different walls etc, all the same.

Really not sure what else to do except keep her PC always connected to the power.

Her PC specs:


  • Intel Core i5­4690 3.5GHz 6MB LGA1150
    GAMING­2GDGigabyte GF GTX960 2GB GDDR5
    KINGSTON 8GB 1600MHz DDR3 CL10 DIMM
    CM Knight 350 Midl tower black with window with USB 3.0
    Cooler master THUNDER series 700W ATX v2.3/2.91, Single +12
    SEAGATE Barracuda 7200 1TB HDD SATA
    TP­Link TL­WN851ND Wireless N PCI Adapter
    ASROCK Z97 ANNIVERSARY LGA1150 ATX 4xDDR3 MaxRAM 32GB HDMI RAID ATX
 

Martin_Guy

Reputable
Nov 17, 2015
2
0
4,510


I basically benched it the first time it malfunctioned since I had no idea what's the problem. I have an identical PSU, and her's messing up during the move seems highly unlikely since I boxed them in carefully and waited for any condensate to dry before powering them on. Is PSU responsible for the static charge buildup? Thank you, I'll read the ling thoroughly to see if I missed something.
 

rar_54

Honorable
Apr 21, 2012
194
0
10,760
Your girlfriend's computer is drawing around 2W of power when "off" and plugged in. So you are saving about 3 dollars a year for your troubles. You will be much better off focusing your conservation efforts on such things as the thermostat setting and LED light bulbs....