Based on that, I still think it's either going to be the graphics card or the memory at fault. ~3GB seems a strange figure to have though, as memory is normally in pairs.
Shane
Not really, Shane. 3096 out of 4 is about right. If there is 4GB installed on the system. Some BIOS report the total RAM in the system; some round up or down to the next figure. A 4GB system will show 3GB.
Yes, the graphics chip will still use some RAM from the system. This is true even with discrete video cards. This has to do with the shared memory pool between the system and graphics subsystem. The "missing" memory we see on 4GB systems is usually the memory allocated to graphics.
Now if this is a built-in graphics subsystem, this will definitely be obvious because of the poor performance.
John