Checking Media Fail... will not start

[Malc_G]

My computer just randomly stopped working and all i get now is a "checking media [fail]" when I turn it on. After the check media fail message it takes me to a screen where it says
"selected boot image did not authenticate. Press enter to continue."
that is all the happens and when i restart I get thr same messages again. I have tried all the startup uefi diagnostic tests
Memory pass, Smart hardrive check passed, and extensive check passed.
Nothing happens when I press f12 I get a little networking boot or something like that appear for a split second but goes right to the check media messages again.
Please help thank you.

[Checkurtech]

Have you made any changes on the laptop prior to the issue?

 I would suggest you to Disable secure boot and enable Legacy Boot mode.

 Please follow the steps provided to disable secure boot:
a.      Completely shut down the laptop.
b.      Power on the system. As soon as the first logo screen appears, immediately press Delete to enter the BIOS.
c.       Use the right arrow key to select Authentication.
d.      With Secure Boot highlighted, press Enter and then the down arrow to select Disabled.
e.      Use the right arrow key to select Boot Options.
f.        With Launch CSM highlighted, press Enter and use the down arrow to select Always.
g.      Press Enter.
h.      Press the F10 key to save changes and restart the system.

 Disclaimer: Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.

                                      Checkurtech

[Ravikiran1]

Hi I have the same exact problem ...
When I followed ur steps ..when I pressed delete button it's not working with its not showing anything ...please slove