Windows 10 upate 1803 stalled

[lesminer]

New computer no apps installed. First went to Windows Update and completed the first set. Started update 1803. It got through most of it. It went to do one of a few restarts and then it stalled. The screen has just the blue HP logo. It will take no input from mouse or keyboard. No flashing light to idicate activity. Its been like that for a over an hour. I am afraid to turn it off becasue I don't want to damage anything. What can I do? I have read about the lack of storage for updating but this computer has a 500GB HDD and 4$B memory. So i doubt its a storage problem.

[WAWood]

@lesminer

From your description, it sounds like you were trying to do a Feature Upgrade from Win10 v1709 to Win10 v1803 -- and that has now locked the PC and refuses to finish.

Unfortunately, there is no simple way to rollback from a failed Feature Upgrade -- as Windows is designed to do this automatically, and if it does not, there is no manual way to force it.

Since MS no longer makes Win10 v1803 available for download (today, you would get v1809), you only have a couple of choices and neither of them is ideal.

First, you could order something know as HP Recovery Media -- which would reformat your entire drive, restoring the PC to its original condition with the OS version that came preinstalled on it.

HP Recovery Media is a set of DVDs and a CD, or USB stick, that will erase the hard drive (removing all data, settings, and applications, reinstall the original OS, drivers, and some HP Utilities.
In some cases, you may be able to order a USB stick instead of disks. You have to order these from HP; they can not be downloaded.
You can look online for Recovery Media starting with the linked paged: http://support.hp.com/us-en/drivers
Once there, input your Product name or number. On your Software and Drivers Download page, select your Operating System and and Version. Click "Update". If HP Recovery Media is available for your machine, down near the bottom of the page, you will see an entry for Order Recovery Media-CD/DVD/USB. Click the "+" symbol to expand that entry and click on Order Media for details.
Or, if you prefer, you can do the same by contacting HP Customer Service:
If you live in the US or Canada, contact information is on this page: http://www8.hp.com/us/en/contact-hp/phone-assist.html#section1
If you live elsewhere, contact information is on this page: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
NOTE: After you get through, stay on the line until you are finally able to talk to some one -- it can take a while!
If you have trouble finding a phone number, then try: 1 (800)474-6836
---------------------------------------
However, HP Customer Support is generally not available on the weekends, so you might have to wait until Monday to contact them.
---------------------------------------
If HP no longer provides Recovery Media for your model, another site you can check is: http://www.computersurgeons.com
When you get the media, if it is a USB stick, insert it into your PC, pressing F9 to get a Boot menu, then select the External USB Hard Drive to boot from it.

Second, you could attempt a new install of Win10 using media you created from this MS link: https://www.microsoft.com/en-us/software-download/windows10

The problem with this second approach is if 1803 won't install properly, it's also likely that 1809 will not, either.