What you are probably hearing there is the mechanical type relay. I wouldn't about that since most newer supplies have voltage controlled relays. The board in the T2200 is most likely an Atholon XP model board which requires a standard atx type supply with a minimum of 300w. If you know someone who can let you borrow an extra supply "known to be good" that will give you the chance to see if the supply or something else is the problem. If not you may have to bring it into a repair shop.