Computer gone a little cray cray

What Power Supply Unit do you have exactly?

Latest drivers?

This looks like an overheating or underpower issue to me.
 
Ok I would do a clean install on the drivers first - removing them via the Add and Remove programs and remove anything from AMD and ATi (with care). Then use DriverSweeper to clean it up after a restart.

Then reinstall the latest drivers again and restart.

Then if that doesn't fix it, monitor temps.

Then after that, I would look at cables.
 
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