Display is luminous but not showing anything

Dear community!

i was replacing my hdd. when i was turning in the notebook, the backlight of the screen is turned on, but the screen isnt showing anything.

i put a picture on and as you can see, there are some brighter spots on the display. but they have been when the book was still working.

i opened it an tried to check the lcd-connection but everything seems to be alright. i tried to reset the bios and it seems that the notebook is booting into bios (there is no os on the hdd because i deleted it on another pc).

since i cant see any bios i'm not able to boot with an usb drive or something...

does anyone know if theres still a chance to save my good (very) old buddy?