Hello, I recently purchased a Gateway SX2110G-UW23. It is a slimline model and the power supply is a Delta 220W. The model number is DPS-220U B-5 A. Ive looked on quite a few different sites looking for upgrades, but I can't seem to find one. Can someone PLEASE help me? I know a bit about computers, but I dont know jack about upgrading the slimline models. I would prefer not to have to return it, but if thats the best way to go then I might..