-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
- HP Community
- Desktops
- Business PCs, Workstations and Point of Sale Systems
- HP Z820 not powering at all. It was working fine last night.

Create an account on the HP Community to personalize your profile and ask a question
01-14-2021 05:35 PM - edited 01-14-2021 10:19 PM
- no lights/fans coming on when I pressed the front power button. I recall seeing the a blue LED that turns on when the power button has been pressed. I've reseated the front panel motherboard header that contains the wires for the front power button just in case that has gotten loose.
- no lights/fans coming on when I pressed the rear power button
- I pulled the PSU and I noticed that there's a green LED on the back. I have not seen the LED light up as well. (but then again, I never noticed the green LED when it was working yesterday as I didn't know it's there)
- I didn't unplugged/plugged back any motherboard power cables yesterday.
- I've just unplugged/plugged back in the main power supply cable just to make sure it didn't come loose.
01-15-2021 11:37 PM
the BST test indicates the power supply is functioning,.......... if you get no beeps/flashing power light then the motherboard has most likely failed on the z820 if you remove the cpu(s) or all ram it will still beep and flash the power light if the motherboard is functional
only thing i can suggest is to do a "factory" bios reset,.....remove power cord then press pwr button 10 sec and then open case remove cmos batt then press cmos reset button for 3 sec and then reinstall cmos batt and power cord and press power button to see if it powers on, if so enter bios and set time/date