I have recently built a new system that has been running great. I have a Raidmax Smilodon Case with an Antec 650w True Power Trio power supply. Everything starts up fine and runs fine but I have one odd issue. I have noticed that if I turn on my computer after leaving it off for a few hours or more (overnight, during the day, etc), when I first turn my PC back on, there is a clicking noise that comes from the area of the PSU. If I walk away from the computer for about 5-10 mins, when I return, the clicking is gone.
When the clicking is active, if I open the side of my case and just slightly push up on the CPU, the clicking goes away. I have tried reseating the PSU and putting back in the screws, and it seemed to help one time, but now the clicking is back.
My PC resides in my basement and with the lights off, the room is usually a cool 66-68 degrees F, so the case and parts are definitely cold when I turn them back on. Could it be that the coldness of the case is not keeping a snug fit on the PSU, thereby causing the clicking, or could it be the psu has a bad fan that clicks before it starts to spin at higher speeds?