How to check the motherboard after purchase?

Question

Iron

Friends, tell me. Bought a motherboard and processor. Ran them in the AIDA 64 stress test. Two and a half hours. Max temperature on the core is 59 degrees, without failures.
Are there any other ways?
And yet, at work, it whistles a little, or something. I understand, chokes. And no load. Under load, the whistle stops. He is not strong. The computer stands under the ear in an open stand. In the case, I think, it will be completely unnoticeable, all of a sudden - this is some kind of bad sign.

Answer 1

check for what? degrees - they are on the cores of the processor, and the whistle is from the chokes of the power supply, probably ...