I was reading about PSU. How do I know if my PSU is upgradable? Secondly, I currently have the following hardware on the computer: separate 48Xcd Sanyo and 16XDVD drives, floppy, 40 gig HD, 1.4 mhz cpu, an HP DVD 4X external writer, Sound Blaster 5.1 Sound card, 56 k V90 modem, newly...