I think there's something wrong with my graphics card.
It started the other day, I noticed games were stuttering unless I had aero theme turned on (weird), and when I woke up today the screen wouldn't come on, so I hard rebooted. Upon trying a few things the system locked up then went to a black screen with just the mouse cursor, and CAD wouldn't work.
Now the system freezes up when I start GPU-Z, so I'm after an app that will test the graphics card, not just its rendering ability but also the memory etc.
I recently bought a new stick of RAM, about a month ago, and it could also possibly be that, I'ma run memtest86 at weekend when I get a memory stick (I used to have loads! Can't find a bugger anywhere though), but I don't know what would be best to test the graphics card.
If it is the card I'm glad it's happening now, the warranty is up this Summer, and that would suck if it happened after that.
I hope it's not though, I've got 2 Asus GTX 670s and one is already being repaired...gone 15 years using Asus without ever having a dodgy part, now I might have 2 of the same, ha


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If the system plays up more and it becomes something I can reproduce then I can go the routes you mention but it's intermittent appearance makes it tricky
CPU Validation 5.198GHz@1.314v with 4.4GHz cache + RAM 2400MHz@1T 