recently my brother and my friend cleaned dust out of the whole computer and put in new thermal paste , ever since then there is a noise coming from the power supply which sounds like a little buzzing electric noise , then it gets even worse when i play gta 5 and fifa it because like a screeching noise and my graphics card gets really hot like up to 74 degrees , id say it would get hotter but i turn the games off just in case , the power pack had warranty on it so we took it back and got a new one but the new power pack does the exact same thing , the power pack is a corsair cx 750m , and i have a gtx 760 2gb graphics card and 8gb ram , i should have any trouble running them games , i had no problems before they cleaned it out , any ideas ? thanks .