I was playing overwatch and sudenly my whole computer was lagging and the audio was messed up too. Overwatch crashed and a window poped up saying my graphics hardware wasn't detected. I restarted and the monitor wasn't coming on until I switched what port it was pluged in on the gpu. Now when I play a game it plays with alright fps for a couple seconds and then the fps goes down to 10. Is there anything I can do to verify it has died?