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From black screen to automatic repair/restart loop

HP Envy Recline 27
Microsoft Windows 10 (64-bit)

Experienced black screen following logon after an update. The Automatic repair has now tried to fix the problem only to get into an endless loop where it says the problem couldn't be fixed and will restart then loop to automatic repair again. It says it is a windows stop code, error 0xc000021a. Have tried to refresh to before the update, wouldn't complete because of a disk error which it said it fixed, only to repeat when I tried to refresh again. Now I can't get to task manager either.

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From black screen to automatic repair/restart loop

Hi

 

Please 1st try a Hard Reset

Press and Hold the PWR off button for 4 seconds to force a PWR off.

Unplug from the wall.

Press and hold the power button for 15 seconds to complete the reset.

 

NEXT consider this...

 

This First part only works when a valid Recovery Partition is enabled.
If it displays an error message then move onto the Second Part:-
OR if you have data you wish to try and save using the XCOPY command.
Then create your own Repair/Recovery/Rebuild/Re-install media or buy a set from HP.

Turn off the computer.
Disconnect all connected devices and cables, Media Drives, USB drives, printers, & faxes.
Remove media from internal drives, and remove any recently added internal hardware.
Do not disconnect the monitor, keyboard, mouse, or power cord.

Turn on the computer and repeatedly press the F11 key, about once every second,
until the Choose an option screen is displayed, and then continue.

On the Choose an Option screen, click Troubleshoot, and work your way through the screens.

Second Part:-
This may require another PC. Find and Download your .iso from…
(You will need a NON_OEM key for W7);
W8.x and W10 should activate automagically from their embedded licence key.
https://www.microsoft.com/en-us/software-download/windows7
https://www.microsoft.com/en-us/software-download/windows8
https://www.microsoft.com/en-us/software-download/windows10

For when it’s a NON MS OS ( iOS / Linux ) creating the install media.
www.microsoft.com/en-us/software-download/windows10ISO

A 3rd party site is (Please be careful)...
https://mirror.corenoc.de/digitalrivercontent.net/

Expand/Extract/Burn the iso Image onto a DVD/USB as needed.
Microsoft’s Creator Tool will make the required DVD or USB.

Even though it has NO actual HP software/drivers included, you may be able to
XCOPY the C:\Users\* area onto a ‘large’ USB stick, via the Command Prompt.

You’ll need to try various drive letters; D:..-..Z: until it’s matched - could be G; mine’s S:

C:\>XCOPY C:\Users\* S:\ /e /i /h (then files like those 3 listed below get copied over)

C:\Users\desktop.ini
C:\Users\All Users\agent.1509128044.bdinstall.bin
C:\Users\All Users\HP Deskjet 2540 series\Help\flash\zoom.swf

Then you can try System Recovery Options / Advanced Options shown in the screenshots.

NB: - W10 Begin with the Automatic Repair, then Startup Settings etc.

From either the C:\ or the X:\ prompt try the following

cd boot
bootrec /FixMBR
bootrec /FixBoot
bootrec /RebuildBCD

If the above FAILS then please try:-
http://www.thewindowsclub.com/install-windows-10-from-usb

 

You may need to change the Secure/Legacy  boot option, and the boot sequence also.

 

 

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From black screen to automatic repair/restart loop

I tried everything I was comfortable doing, did download the .iso but got the black screen even after the install. I got in touch with HP Smart Friends support and worked with their tech all day Friday and again Saturday to get the system back up and running. Thanks for all your replys, such a wealth of knowledge and support here. 

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