Hello, Recent purchase of a grafics card freezed my computer, the power supply is only 220 Watts. The computer model is AX1420G-U5832, where can I find a suitable power supply. I'de like a 270 to 350 if it can be found. The size seems to be the issue. It is just over 3.35 wide, less than 2.00 high, and ust les than 7.00 long. Can anyone help?