ian76 0 Newbie Poster

Hi I have a HP laptop NX6310, when I turn the laptop on the screen stays off but the rest of the PC turns on i.e. the power light, harddrive light and the charge light.
If I leave the laptop turned off over night and turn the machine on it turns on but does not get past the XP loading screen.
I have replaced the RAM and the Harddrive and still the same.
Please can you advise me what might be wrong!!! Thanks