I built a new system for my in-laws: Generic case, Roswell 400watt power supply, Kingston PC 2700 512MB RAM, ASUS P4GE-MX Motherboard, Celeron D 2.4 GHz processor, DVD drive, DVDRW drive and a 40 GB Maxtor PATA drive. After I built it the first time it ran fine for a couple of days and then it...