Power supply needs to be replaced if the fan is not running (or you need to be frugal like me and rip it open and replace the fan
The other thing you are taking about
cla punk noise every 5 or 10 seconds while runnig
usually this is a hard drive dying. I would back up your data after replacing the power supply, and run hard drive diagnostics. You may have to replace your hard drive.
If you need help with running hard drive diags, let us know what kind of drive it is.