Can't Access Bios on HP Z6 G4

[Harsh_Palan]

I have tried to all solutions available from reseting CMOS to changing usb port for keyboard. But I'm able to access the BIOS settings for my workstation. 

HP Z6 G4 Workstation 

Intel(R) Xeon(R) Silver 4112 CPU @ 2.60GHz

32.00 GB (31.71 GB usable)

[SDH]

I've seen that here very rarely and the workaround that worked was to use a PS2 keyboard instead. That bypasses whatever primative USB glitch is causing the problem. You can still buy brand new nice HP ones off eBay.

Once I could get into BIOS that way I set a 5 second post delay and have never changed back to a USB keyboard. There can be CMOS corruption that is odd and only corrected by a true deep level CMOS reset rather than the usual yellow button push. That might have already happened... I should test with a USB keyboard again.

[DGroves]

many usb keyboards that are under 30.00 play fast and loose with the usb spec their circuitry is just the bare minimum to get a working keyboard interface, due to this some keyboards will have issues with some systems

(and some cheap consumer systems motherboards are also cutting corners on build quality)

usually swapping the usb keyboard will fix the issue, however as "SDH" stated a ps2 keyboard  will almost always work however again i've seen really cheap ps2 keyboards that again can be troublesome due to poor circuit design

[Harsh_Palan]

Is there a workaround for the PS/2 keyboard thing? 

[SDH]

My logic when I discovered that a PS2 keyboard would get me around the problem of not being able to enter BIOS from a USB keyboard was that those use an entirely different more primative subsystem of the BIOS and OS than USB does. Something is corrupted in one or both of those parts of USB or your keyboard itself that prevents normal function.

The same concept holds for doing clean installs and troubleshooting odd problems, so I switched over to only using PS2 keyboards for all that in my IT work. In my normal work at our enterprise we all pretty much use USB keyboards but I let our IT guys know about this trick. They've used it successfully also. DGroves in his post above gave you a possible workaround... just try another good HP USB keyboard. That does sometimes work as he noted. He covers a much larger enterprise environment and surely is near or at the top of their troubleshooting talent.

Personally, I'd just go on eBay and buy a nice brand-new HP PS2 keyboard for about $20.00 including shipping.

Q: Guess who else uses those, and why PS2 ports are still on the back of HP workstations? 

A: Big "3-letter" government agencies. They fill the workstation's USB ports with epoxy, too.