The PSU has been working for well over 5 years
PSU is an Eagle DR-B350ATX
I suggest you follow the psu recommendations from post #2 see the link below and you will understand why; http://www.techimo.c...wer-supply.html
Have you got a spare CMOS battery for the MB, if it is the original battery it may have died and this could also cause you issues.
Edit: Below are the system requirements for the Geforce 6600, you will notice that the card requires 350W alone;
Intel Pentium 4 Prescott class processor or higher (LGA775 processor package) or AMD Sempron/Athlon
Microsoft Windows 2000, XP
A PCI Express compliant Motherboard with a x16 lane bus compliant slot
128MB System RAM (256MB recommended) 350W power supply
50MB of available hard disk space for full installation
CD-ROM or DVD-ROM drive
VGA or DVI-I compatible monitor
Edited by phillpower2, 04 October 2010 - 09:51 AM.