A relative of mine has some problems with the computer. The screen is blank all the time (thus you can't enter bios, ...).
This happened after a computer restart, before it used to work normally. The computer "works" (you can hear the fan and the lights are also working). The screen should still be working, because it displays no signal found if you disconnect it from the computer. The screen is properly connected to the computer. There were no hardware changes in the computer. The computer probably had some viruses, but I don't know if a virus could do this. Also the computer is quite old so maybe something isn't working anymore (I assume the graphic card).
Any ideas what could be wrong and how to fix it? Because the only reason that I can think of is that something isn't working anymore (graphic card).
Thank you for your time and answers.
* UPDATE: * The last restart was caused by the user (pressed restart button), because the mouse icon disappeared or froze (didn't quite understood).
The "POST" beep could be heard, but not the "windows" sound. Also other "sounds" (fan, ...) can be heard from the computer.