did you install the correct and up to date drivers? if not that could be the problem.
[-0MEGA-];682183 said:First off, you dont have a 6.8Ghz dual-core processor. You have a 3.4Ghz Pentium D.
What video card did you install? Some require an additional power adapter(s) to be connected to the card, otherwise it wont run well. And speaking of power, your PSU may not be able to support the card you added. What video card is it exactly? And do you know how many watts your power supply is?
I was referring to the wattage and amperage of your power supply.size as is 8x, 1.5V?