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‎07-19-2025 02:52 PM

HP Recommended
Product: HP Pavilion Notebook - 15-ab121dx (ENERGY STAR)
Operating System: Microsoft Windows 10 (64-bit)

WIN+V and power button give a cmos checksum invalid error 502.  I have changed the CMOS battery, have new main battery, load the latest BIOS and reset BIOS to default setting but still getting the error.  Also Windows 10 will not boot if TPM is available. Load OK if TPM is hidden.  Been working on this for awhile but with no success.

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