Solved!
Go to SolutionClear ePSA Event Log
After doing a hardware scan using the Dell Enhanced Pre-Boot System Diagnostics (ePSA) on an Optiplex I found some hardware issues, which I have now resolved.
Now I want to clear the messages in the Event Log tab, however there is no option for it. How can this be done?
zheglov
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Posted July 31st, 2015 13:00
OK, I figured it out myself. The log is stored in a UEFI variable called "DIAGEEPROM". You just need to delete it. For example, boot from a ubuntu live CD and do
sudo rm /sys/firmware/efi/efivars/DIAGEEPROM_VAR-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
where the Xs are numbers specific to your system.