Flat panel problem - please help

I am in the process of upgrading my employers CRT's to E153FP flat panels.

On the majority of machines these work fine. However on a few machines there is an image problem.

It almost looks as though it is interference as the image is not stable and keeps distorting.

However i have ruled out interference by replacing the base unit with another system and the TFT works fine (in the same location).

So now I know that it is a hardware/software issue - but which?

 

The PC' managed the same resolution, 1024*768, on CRT's so what could it be. The chipset is an Intel 82815 graphics controller. memory=4MB. Pentium3 1Ghz. 382RAM.

Could it be the chipset? Surely this PC is of a high enough spec...

 

 

Please help as this is driving me crazy!!!

 

thanks

Matt