Dell OptiPlex 990 (Early 2011) - Manual (Page 65)

System Logs
• Clear Log
DellDiag Events Displays the DellDiag event log.
Thermal Events Displays the thermal event log and allows you to:
• Clear Log
Power Events Allows you to clear the power event logs.
• Clear Log
BIOS Progress Events Displays the BIOS Progress event log.
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