One wonders why you asked here and not your PC's customer support. Make use of the warranty. Reason being, any suggestions given here may void said warranty.
Sometimes my 4 month computer's power supply fan makes a whirring, humming sound after I turn it on. I know some computers are pretty loud when they turn on, but this persists until I turn the computer off and on, and it's not a usual occurrence.
When I feel around the back of my computer where my power supply is when this sound is happening, and it's not hot or anything, and there's clearly air still circulating. If it's not overheating, then I thought maybe dust was messing it up, and I cleaned dust out with some compressed air, there wasn't much in there though.
So what do you think the problem is? Is it even a problem? From as much as I can tell there's nothing really wrong yet, the sound is just annoying, but I want to know if I should look to get my power supply replaced in the future or something.