My power supply goes out on my HP Pavillion every month. I have bought 4 new power supplies so far. I have been told I need a better power supply and possibly a better video card. which power supply & video card should I buy to get the best performance from my desktop. one that wont be good for only 1 month. my current power supply is 350. my current video card is ATI Radeon 4200. do I have to change the video card and the power supply? or just the power supply?