I am on my gf's PC, and it randomly starts getting really loud. I open the case and I hear the PSU is really loud, even though the system isnt hot. It does it when its idle or when underload, but its completely random. The model number on the PSU is l250ns-00 . It is one of those small premade systems she got from dell.com. Does anyone know if this is fixable without having to buy a new PSu? Thank you for the help