At home I have a 1998 vintage "Frankenstein" PC. I recently put in a usb card, memory card and a CDRW drive. I think the latter pushed it over the edge. I've been dabbling with the idea of replacing the motherboard, cpu and probably a new cpu fan and power supply. If my math is right, even with a trip to the PC doctor, the results will be cheaper and possibly better than buying a new box.
Has anyone done this? Words of wisdom?