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CMOS Settings



Ok here's the deal.

For long enough now when I have had a power outage I have had to re-set the time, date, no floppy drive attached etc.
I thought it may have been the battery failing.
On a normal shutdown and boot up all would be ok.

Anyway I replaced the battery two weeks ago and I have just had a power cut again and the same thing happens.

Any ideas guys?

Tony D

Free PC Help Long Term Member
Dec 30, 2007
Malvern, PA (USA)
PC Experience
Some Experience
Operating System
Sure sounds like the CMOS battery. Could you have replaced it with another bad battery? Maybe the contacts are bad. Maybe a circuit board run to the battery is bad.


As I say Kelly the battery or batteries, as they came as a pair in a blister pack, were brand new with an expiry date of 2010.

Time/Date etc keep perfectly well otherwise.


FPCH Long Term Member
Dec 17, 2007
Operating System
Windows Vista - Home Premium
I've posted about this issue before on another forum.

I've experienced it a few times when a computer comes in my shop, and when it's returned. For whatever reason, some mobo's charging circuit requires AC power at all times.