All-in-one will not start

[Kenphotographer]

My all-in-one decided to stop with a Green Screen warning yesterday and will not now restart. It goes into repair mode and will not come out of it, even after some 12 or more attempts. I have tried alternative methods of rebooting, but the best I seem to achieve is a msg advising a repair is underway.

Anyone have any ideas?

[WAWood]

@Kenphotographer 

Unfortunately, that error message nearly always means that a recent Windows Update failed and Microsoft then tried to recover from that, but that failed, so it's trying over and over again -- and will never succeed because Windows Update got corrupted in the process.

First thing you need to do is see if you can restart in Safe mode -- by doing these steps: https://www.tenforums.com/tutorials/2304-boot-into-safe-mode-windows-10-a.html

If you don't know how to start using Advanced Startup Options, then read this: https://www.tenforums.com/tutorials/2294-boot-advanced-startup-options-windows-10-a.html

Then, follow these steps to reset Windows Update: https://www.tenforums.com/tutorials/24742-reset-windows-update-windows-10-a.html

If these work, when you finally reboot, you should then be able to login to a working Windows desktop.

[Kenphotographer]

Thanks for your response and I agree with your assessment. 

However, I cannot stop the system reverting to the same startup window which says its trying to update. When I start with ESC pressed I get to a limited list of options, none of which seem to give me any advanced options.

[WAWood]

@Kenphotographer 

The Esc key brings up the HP Startup Menu and there are no advanced options for that.  As this is used only for troubleshooting.