All is well again. I called a mobile tech service and they came straight away. My video card had died but apprently it was an extra card in the system so she used the one that was on the motherboard did some download of drivers and generally tweaked the system and my desktop is brand new again. Since everything was wiped off I have to download everything again but a small price to pay. The whole thing cost $157 with labour so I am pleased maybe this desktop will last another few years.