# Fix CMOS Checksum Error: Step

> A CMOS Checksum error occurs when there is a conflict between the CMOS (Complementary Metal Oxide Semiconductor) and the BIOS (Basic Input Output System) during computer startup.

- **Source:** [Lifewire](https://www.lifewire.com/cmos-checksum-error-what-it-is-and-how-to-fix-it-4689193?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=688cddc24db72baec24e7ea1)
- **Published:** 2025-08-01
- **Category:** Apps
- **Tags:** #cmos #checksum #error #computer #information #startup #step #basic
- **Canonical:** http://localhost:4321/a/688cddc24db72baec24e7ea1

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_GearOpen's distilled summary. The full original article is published at Lifewire (source link above); GearOpen does not republish the source's full text._