Problem with graphics card.help PLZ!

Hello to everyone!A month ago, my graphics card burned out and a friend of mine gave another one.I didn't install the drivers for this card but the drivers of the series of this card.After two weeks, i see a blue screen on the monitor with the message:NOT_LESS_THAN_EQUAL something like that.I think this is because of a bad installation of a driver and has something to do with memory. Then i rebooted the computer and after a few minutes, the blue screen appeared again.After a lot of reboots, i close the computer and turn it on again. It started working, but i had no signal on the monitor. After a few times i repeated this action, i had signal but after a few minutes, blue screen etc. From then i try to turn on the computer and i have no signal, while the pc is working.I tried to change the graphics card with another one as well as the monitor and i had the same result(no signal), although the graphics card and the monitor i had, worked on another computer. What can i do?