This morning the computer worked fine and shut down appeared to be normal, this afternoon i turned the computer on, i got the windows boot up sound but no graphics on screen. The graphics fan runs.. on taking the graphics card out, and connected screen to on board graphics it was looping with the windows shut down unexpectedly message. NB When the graphics card is connected to the computer the fan still spins ... I Dont know what to try... I Connected the computer to another screen.. the promblem still occurred....

What Windows boot up sound? Do you mean beeps? Or the little "jingle" when Windows is just about fully booted?