It is a brand new PC out of the box. It's a HP Pavilion A6501.uk PC - Intel Celeron Dual Core E1200 with 2 gig of ram. It came with Vista home installed, the problem was the same and I blamed the OS / drivers and loaded XP Pro instead, it is however still, exactly the same. The onboard video card was the same as is the nvidia card that is in there now and an ATI card I tried previously.