PSU fan attemps to turn then stops (underload)

since is a thermal control design while idle my pc barely uses 1/4 of it  so its normal not to spin but under load its tries to spin and does for a few seconds before whining and stopping then starting again other people are having this problem too rma isnt an option since my local computer store only has a 7 day warramty and the problem beacame apparent 2 weeks later. what do i do

The first thing I would do is stop purchasing items from that computer store. Sorry to hear their policy, it sounds ridiculous. I would contact the support from the company that manufactured the PSU and see what their RMA set up is.

What brand PSU? I've had a corsair one go bad and they took care of me no problem. They sent a new one out before i sent them the broken one.