PC requires a CMOS reset a day

Martini1991

Martini1991

Martini1991

Caporegime
Joined
18 Sep 2009
Posts
30,515
Location
Dormanstown.
Hello there.
I built my mate a PC using my old set up (The one in my sig).

So it's got my old Phenom II c3 @ stock.
4GB DDR2 G.skill
And my old Gigabyte 790GX board.
It's got a 550W Antec PSU
That new casecom case
A 500GB WD HDD.

Basically, his PC requires a CMOS reset, or it won't detect the keyboard/mouse.
It never did this when I was using it, but he's not changed anything , and I built it.
The other day it worked for two days without requiring a CMOS reset.

It's odd to say the least, does anyone have any suggestions?
 
I honestly have never heard of that issue before!

Try a new CMOS battery for a start off. I guess the keyboard/mouse are both PS/2?

Probably wont help but also worth a try - put the CPU back to stock speeds.
 
Mouse and keyboard are USB.
At one point I plugged in three keyboards, it detected none of them, one was PS2.
The CPU is at stock speeds lol.
 
In the BIOS all the legacy USB stuff is enabled, everything to do with USB enabled yeah?

I have to say this is a very tricky problem to resolve.
 
Not sure what it can be, but I would either test the CMOS battery with a multimetre or use a known good CMOS battery in it but I doubt its that. I just can't think what else it can be other than a faulty motherboard?!

Please let us know if you find out what the problem is cos I will be working as an IT technician soon and it will be useful knowledge.
 
I had an old iMac that did something similar to this - I changed the CMOS battery and it was fine.
If its quite an old mobo that you used to use quite often the battery might have started to wear out.
Other than that it might just be the mobo on its way out, if its been used extencively, may have been a bitfaulty, and the rebuilt might have not helped.
Give it a try with the new battery, if not then maybe flash the BIOS?
 
xJcBx said:
I had an old iMac that did something similar to this - I changed the CMOS battery and it was fine.
If its quite an old mobo that you used to use quite often the battery might have started to wear out.
Other than that it might just be the mobo on its way out, if its been used extencively, may have been a bitfaulty, and the rebuilt might have not helped.
Give it a try with the new battery, if not then maybe flash the BIOS?
Click to expand...

We've used different BIOS's.
It's under a year old.
 
There is no harm in trying a new CMOS battery it may actually fix it, you never know!!

It will take like 30 seconds!!
 
Battery should last 4-8 years with an average pc thats plugged in (PC off, PSU still delivers a 2 amp 5V standby current to power various bits and pieces). If the mains power is off at the wall, the battery life can be as low as a year, but thats abnormally low.

Anyway if the battery is low or faulty, then the CMOS has a high chance of being corrupted any time the PC is turned off, and even greater chance if the PC's turned off at the wall rather than the case panel button.
 
Got a mate thats got an old dell that wont boot unless the bios is reset every time.

In his case its a faulty motherboard as there is a capacitor with a wee bulge on it near the bios chip.
 
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