First of all thanks for the respone. I have changed monitors and all cables with ones that work on a different computer. I have also taken out all my cards (graphics, memory, sound) and reseated them. The computer when i switched it on today started up i had a picture and it loaded up. i then switched it off and back on and it didnt have a picture. When i switched it on there was a beeping sound as normal it still runs all parts working but no picture through the monitor, ne more ideas people.

Thank you.