Bios corrupted after Windows Update

[Radek_Z]

After selecting optional updates in Windows 10, including bios update. After the restart, the computer only booted into the HP logo. After a CMOS reset (yellow button on the battery), the computer only cycles the fan for about 10 seconds. No screen, USB keyboard off... Help please!

[BeemerBiker]

This does not seem good.

If the keyboard works it is possible to recover the old bios using the WIN+B key

Unplug system from wall, wait a few minutes then plug it in and turn it on while watching the keyboard.

Does the keyboard LEDs flash:  CAP or NUM lock light up?

If the keyboard works try the following

https://www.youtube.com/watch?v=qpiGUojtr3E

If the screen is not working you will have to guess as to where the response is to be done.  I do not have any HP system with the WIN+B key feature as all are older.  Possibly you can just press the return key or punch the tab button to (Hopefully) go to the next instruction in the video.

If indeed the keyboard is dead and system not functional then you are limited to

1 - warrantee service

2 - pay to fix it: buy new chip and take to someone with the skills  Frequently a used computer on eBay is cheaper than any repair.

3 - fix it yourself.

If 2 or 3 is only option then you can get BIOS chip here

 As explained at that site you will need the skills to replace the chip.  Not mentioned is the possibility of using a "silver" ink (conductive) pen to "piggy back" the new chip.  The old chip would have to be carefully ground or cut off from the motherboard.   The silver or nickel adhesive in the pen used to re-attach the new chip.

In the past, I have used conductive pens to convert AMD Athlon chips from single to multiprocessor by bridging connections that were cut. I suspect this approach might work if you have a steady hand and there are no other alternatives.