What does it mean when the Power On Light is flashing red?
A flashing red Power On Light indicates there is a problem with the computer and it is displaying a diagnostic code. You should refer to the Maintenance and Service Guide to interpret the specific code. Under normal operation, the Power On Light is white when the power is on. (Page 12)
From the official HP Elitedesk 800 G2 Small Form Factor PC manual, page 12
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