2 Different Video Cards, Same Problem
I need some advice about my poor computer, I don't know anything about computer hardware but I'd like to figure it out so I don't have to take it to a shop.
I got the whole system second hand, it was a custom built gaming machine. It ran well for about 6 months, then one day it just wouldn't turn on. I replaced my original PSU (Corsair VS 650) with a spare Corsair CX 500 to see if that would work and it did. I eventually got the current PSU (Corsair VS 750) and everything was fine for a few months.
I was playing a game one day, all of a sudden the screen and sound froze, then the screen went to grey with horizontal bars. The system would turn on, the monitor would give me a "No Input" signal. I checked the monitor cords/plugs, everything was fine there.
I replaced the AMD Radeon r9 280 that came with the system with my old NVIDIA GTX 660 and all was well for about a week.
While I was playing a game before, I had the same problem appear with the frozen screen/sound. The tower refused to power up properly and had to unplug/power button and wait awhile before it would start. It seems to be alright until I play a game of any kind.