Hello everyone. My grandmother gave me her laptop to fix it. When i turn on the laptop it says "a disk read error ocurred. Press Ctrl+alt+del to restart". Obviusly no matters how many times i restart it, it will say the same. But i can't even enter in BIOS. If I press F2 nothing happens. No key works to do something. I press F2, it freezes and then the error message "a disk read..." appears. If I press some key like F12, a black screens appears.