Question Cant open windows in UEFI mode

[Seth_opti7020]

I have this old dell pc where it would often say hard drive not found i tried to go safe mode and restart and it surprisingly worked until it happened once more the safe mode trick didnt work i tried to took things up a notch i watched videos to videos in youtube and decided to try one of those i spammed my f2 and did exactly as instructed and that includes
Turning secure mode off and switching it to UEFI mode and more when i restarted the pc the display wouldnt work i stared at the dell logo bouncing around with no sign of display or whatsoever i once again searched in yt and found out that i have to use the battery trick i removed it waited 10 seconds placed the coin and my gpu that was blocking it decided to see if it would finally work but no still no sign of display i checked the gpu and the vga from monitor to PC and still dosent work did i did something wrong? Like do i need to buy a new battery or do i have to use the pin jumper trick aswell. i really need help


Oh and btw at the hard drive not found it was also followed by the BSOD thing i have a dell optiplex 7020

 

[Krotow]

If boot mode in BIOS was Legacy/CSM, switching to UEFI will cause system to "disappear". Switch back to Legacy/CSM mode.

 

[Seth_opti7020]

If boot mode in BIOS was Legacy/CSM, switching to UEFI will cause system to "disappear". Switch back to Legacy/CSM mode.

Well the thing is that i cant boot or open my pc the screen is blank and nothing is appearing but the fans, mouse and keyboard seems to be working (glowing)

 

[Seth_opti7020]

I also tried spamming f2 which would open Bios mode but since there is no display i wont be able to see things, i tried the Key combination on bios that would reset my bios setting but it didnt work.