BIOS settings reset after power loss
4.5
The computer loses its date, time, and custom BIOS settings every time it is unplugged.
Symptoms
- "CMOS Checksum Error"
- System time incorrect
- Boot order reset
Possible Causes
- Dead CMOS battery
- Motherboard short
- Static discharge
Step-by-Step Fix
1
Replace CR2032 Battery
Open the case and replace the small coin-cell battery on the motherboard.
2
Update BIOS
Sometimes a firmware bug causes settings to not save correctly.
3
Check Power Supply
Ensure the PSU is providing stable standby voltage.
When to See a Technician
A dead CMOS battery is the most common cause of settings loss in older PCs.
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