Hi fire wizard I built a new system using msi pn7 diamond core 2 intel 4gb dominator ram 2 nvidea 9600gt and sata hd 500gb, i had got it all from dabs.com first m/b would not allow windows install graphics kept scrambling at first windows screen sent it back got replacement and all went well, now whether comp is running guild wars or just sitting at desktop screen graphics gets scrambled at random times, comp does not overheat. When this happens the reset button does not do anything i have to press and hold power button till it shuts down i wondered about ram voltage dominator ram box states 2.10 volts but memory volts seem to be set at 1.9 could lower volts cause failure, i am now at wits end and stabbing in the dark thinking vista is the problem. almost forgot have tried replacing video card with totally different one this didnt work pulled all ram and tried 1 strip at a time same effect. Thanks for your help Holbay