Posted 01 August 2008 - 03:11 AM
Just built a new system with an ASUS P5K Pro MB, BFG 9600 GT Video Card, Antec Truepower Trio 550w PS, 4GB Kingston dual DDR2 memory, and 2 identical 750 MB SATA HD's. Everything New.
Everything works fine in startup but I get an unexpected shutdown (no errors, just a switch off) at times when I do certain operations. The first time was before I installed an operating system and was making changes in the bios. I eventually was able to update to the latest bios for the MB.
I was able to install Win Vista 64 bit OS as well as SP1 without any problem. The computer will run all day without a problem as long as it isn't required to do certain tasks, but when I go to some web sites to download some software it may inexpediently shut off. No error message or blue screen ever. It will reboot just fine after that.
I ran the Windows Memory Diagnostic Tool test and it runs perfect until it reaches 19% complete on first pass then shuts off. No warning or no error. I have substituted two different other new memory modules and the same thing happens each time, so it obviously isn't the RAM memory but the memory test triggers something that causes the switch off.
It would seem the problem is either the Video Card or the Motherboard.