Power button not working in Z420 workstation

[Shenzy]

Front panel connector pinout HP Workstation Z420

I want to jump start pc as power button is not working but not able to figure out the position of powers pin that needs to be touched to jump start the motherboard.

[BeemerBiker]

Pinout is shown here

https://h30434.www3.hp.com/t5/Desktops-Archive-Read-Only/Front-panel-connector-pinout/td-p/5540808

you can obtain a replacement cable here

https://www.ebay.com/itm/224840533979

[Shenzy]

Thanks, but I am looking for screwdriver hack, I am not able to find which 2 pins should be touched to jumpstart motherboard.

As per you provided link I have tried to jump two pin 7 and 9 but it didn't power up the pc.

[BeemerBiker · Accepted solution]

You may have to short the pins for a full 20 seconds as follows:

unplug power from wall

short pins 7 & 8 for a few seconds to discharge capacitors

plug power back on and  hold down pines 7 & 8 for full 20 seconds.

I assume you have a real z420 system and not an ATX power supply with 18 pin adapter.

[Shenzy]

It did work, thank u so much.

But it observed a more noise coming from fans or from somewhere (still kind of figuring it out) and now my keyboard and mouse stops working when it restarts(as I am installing windows and when it restart itself) and monitor screen also stuck at a single point. Any thoughts on it?

[BeemerBiker]

glad you got it working!

If you are instilling from scratch, you might want to to with windows 11

https://jensd.be/1860/windows/upgrade-to-windows-11-22h2-on-unsupported-hardware