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To summarise, a few days ago I had a new graphics card installed to replace an old, overheating one (its fan had broken). The new graphics card is an ASUS GTX 560 Ti. However, after the first few days of using this graphics card, my PC began to crash frequently, specifically when any 3D game is being played. There are no signs of overheating, and using temperature monitoring programs, my CPU and GPU temperatures are fine.
When my PC crashes, it usually doesn't produce any artifacts or screen-tearing. The image either freezes then the monitor displays 'no signal', or my PC restarts itself. I have also had a crash result in a simple brown screen. These crashes are sometimes accompanied by my sound hanging and skipping, and usually the only way to recover from them is to power the PC off via removing any power going to it (ie unplugging it from the mains electricity).
My power supply is adequate, I believe - it is 727.8W max.
If anyone can help me diagnose this problem I would appreciate it. :)