hi ,right i have now tried a different psu and the same happens ,i have taken battery out for over ten minutes and reseated the memory .computer will now run but cant see anything on the monitor ,have been looking at this and something i have noticed is that if i have the grapics card adapter on the monitor cable the light on the monitor is amber if i take it off monitor light goes green staight away and has no signal on screen ,i,m thinking it could be the adapter ???? what do you think