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When a CMOS battery fails, the BIOS settings will reset to default. This may or may not be acceptable depending upon the configuration of your computer. Thus, once the CMOS battery is replaced, you need to go into the BIOS setup and check every setting to see if its is set appropriately. Depending upon your BIOS, access to the BIOS setup during system startup will differ.
The BIOS on modern computers often configure many things automatically during the boot process, but the BIOS in older computers such as those running XP may not do that.
------ Original Message ------
Received: 09:45 AM CDT, 03/19/2020
From: "Ken Campbell" <n6pcd1@...>
Subject: Re: [070Club] Contest
With regard to your old XP box, looks like the CMOS battery on your motherboard is shot. That’s what keeps the clock settings when you power down. It’s most likely one of those button cell batteries like a C3022. EASY to replace, will cost you about $3.00.