I had been having problems with charger cable, then I switched on computer and there is a screen that only allows me to insert user's name and password. Can not open administrator , nothing. can't this be a bug????
Nope it cannot be a bug. But it could be someone else's computer.
When you switch on the rig, what you see is a BIOS restriction . For that you'll need to get intouch with the vendor and prove it's your PC/Laptop to get help.
Here , NO, we'll not be helping you out.