del works with NUM. lock off, if is DEL
del key is del and dot,. do not use dot key.
yours users manual covers all that, all PCs do.
no 2 are the same vast BIOS exists and version and contract versions , endless now. 40 years deep.
what is MEDION, is this those odd duck rare African state issued PC, nobody can fix? (expect there in africa)
Go to your store, and ask them where the manual is you lost.
power ON now., see bios run POST. next. then
I hammer Fn key try them all 1 by 1 at power on.
12 times ,for each one, f1 up.
lacking a manual what else is there?
or ask them.
none one here in USA