HP Z420's power button illuminates upon pressing yet fails to activate the device.
HP Z420's power button illuminates upon pressing yet fails to activate the device.
HP Z420 Workstation operates smoothly after clearing CMOS and connecting power. Once activated, Windows 10 installs and updates proceed without issues. Restarting requires disconnecting the power cable, pressing the CLEAR CMOS button on the motherboard, then reconnecting it. This method seems to resolve the shutdown problem. Other Z420 models with similar concerns are available for spare parts.
Do you possess a CMOS cell in your device? It appears it's failing and should be swapped out.