>>I have seen cases where a mobo will spontaneously disable its onboard LAN adapter, or other onboard devices (usually if the CMOS battery is getting low).
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>What is "mobo" and how do I check if the CMOS batter is low?
Mobo is shorthand slang for motherboard. Most computers will give a warning at boot if the CMOS battery is low - usually an extra beep, and maybe a screen error message that you have to acknowledge. However, I've seen BIOS settings change or get lost due to a low battery, before it gets so low that you get an error message at boot.
A typical lithium button-cell CMOS battery should be good for about 5 years.
Regards. Al
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