black screen before windows login screen

[hamri]

i have an hp z420 with a CPU Intel® Xeon® Processor E5-2643 v2 12core 3.50ghz,

and i have a problem with the strat up of my pc,

every time i turn it on, i get a black screen with a loading loop before the windows login screen,

i can not acces to task manager or anything else,

i don't know what the problem i tryed to change the place of rams but i didnt work....!!

any help?

[Lil_Boy_Blue]

Hi

Does the boot process continue and you can use Windows 10?

First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

AND/OR - Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

AND/OR - Windows Logo key + Ctrl + Shift + B
(This key sequence actually restarts you graphics driver (W10 only).)

[hamri]

hi 

yeah i use Windows 10, it give me the black screen with a loading loop just before the windows login screen,

i did what you told but unfortunately it didn't work...!!! 😕