To answer the question about the power supply - I have not come across a power supply fan that was on a thermal control, but it might be possible. All of the ones I see are fan on all the time. Some might change the speed of the power supply fan when under various load conditions but I would not expect it to be off.
I looked up VIPOutlet to see what that was. It appears to be a used market PC but they do offer a 90 day warranty for the products they sell. They also offer a 30 day return policy. However, since this is a used PC and out of HP warranty, I suggest you contact them for repair or replacement.
I'm not an HP employee.
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