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After test if it doesn't need more passes for repairs, use the Advanced Seatools to wipe the HD for clean reinstall. Clean Install Windows 7
Did you run the SeaTools short test? You seem to be saying you did but don't report the results.
And you don't say if you are running the long test when it tells you it will take 6 1/2 hours. Yes or no?
I've had a quick read through of this thread and I think it could well be a power problem. NVidia recommend a minimum PSU of 500/550W for the GTX 560Ti graphics card and, although you have a 650W unit, that only leaves 100-150W for the rest of your system.
Are you familiar with using a digital multimeter to backprobe the power supply connectors to monitor the voltages whilst your system is running? If so, could you use this technique to monitor the auxiliary 12V supply lines to your graphics card (the 6-pin connectors) and report back what voltage you are getting under normal conditions (idle) and again under load (running the game you're having problems with). I want to see whether the voltage drops below the ATX toleration limit of 5% (11.4V) when the card is under load.
I'd say no. Most 120mm fans run on a quarter of an amp or a half amp @ 12v. So that means the use between 3 and 6 watts each. Probably a typo in whatever article you are reading.
You can look on the label of the fan and it will say how many amps it draws.
Watts = Amps x Volts.
The fan symptoms reinforce Dwarf's suggestion that the power supply could be defective. A supply that is not pumping out power on a smooth curve will cause all kinds of odd symptoms.
Can you borrow another power supply from someone to test with?