Ive already looked at other threads which contain similar problems to mine but they are not exactly like mine so i need some help. Ive installed windows 8 on my hp touchsmart iq500 and it runs smoothly without any problems, except one big one. When i start up my pc or do a restart it loads up the start screen like normal, but if i leave it without moving my mouse, after about 30 seconds the screen goes completely black and the computer fan starts whirring quite loudly. The screen also goes completely blank if I leave my pc running without opening up a programme or moving the mouse and is stuck like that, ctrl, alt+del doesnt work so i have to manually switch off my pc by holding the power button and rebooting it again.The problem with the screen going black and blank doesnt always happen but its preety consistent with when i load up my pc without moving the mouse or loading up a programme. if i do load a programme the pc seems to work fine.
Also I have installed the windows updates and also removed them to see if this helps but the problem still occurs.