Dual colored power LED on front of computer to indicate either normal or fault condition
• Diagnostic LED Explanation Table:
o Power LED will blink red 2 to 5 times, then blink white 2 or more times, then repeat (with beep tones for each
blink initially):
▪ 2 red + 2 white User must provide file for BIOS recovery (USB storage typically)
▪ 2 red + 3 white User must enter a key sequence to proceed with recovery by policy
▪ 2 red + 4 white BIOS recovery is in progress
▪ 3 red + 2 white Memory could not be initialized
▪ 3 red + 3 white Graphics adaptor could not be found
▪ 3 red + 4 white Power supply failure / not connected
▪ 3 red + 5 white Processor not installed
▪ 3 red + 6 white Current processor does not support an enabled feature
▪ 4 red + 2 white Processor has exceeded its temperature threshold / system thermal shutdown
▪ 4 red + 3 white System internal temperature has exceeded its threshold
▪ 5 red + 2 white System controller firmware is not valid
▪ 5 red + 3 white System controller detected BIOS is not executing
▪ 5 red + 4 white BIOS could not complete initialization / PCA failure
▪ 5 red + 5 white System controller rebooted the system after a health or recovery timer triggered
• HP PC Hardware Diagnostics UEFI:
o This utility enables hardware level testing outside the operating system on many components. The diagnostics
can be invoked by pressing F2 at POST, and is available as a download from HP Support
hp z workstation diagnostic codes
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