HP SERVERS: The HP ProLiant servers have a number of diagnostic LEDs on the front of the case (some instructions are on the inside of the lid).
If the LED's on both power supplies are 'green' then try removing all interface cards and memory and see if it beeps or does anything on power up.
HP's ProLiant troubleshooting guide has some great info to troubleshoot many common issues.
https://support.hpe.com/hpesc/public/docDisplay?docId=c04444029
HP WORKSTATIONS: support.HP.com has many great resources for troubleshooting your HP workstation!
https://support.hp.com/us-en/products/workstations-thin-clients/hp-workstations
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