My laptop is a sony vaio vgnfw41e bought about two years ago. Randomly the screen blanks out, from some angles you can still see the display but very very dim, normally it just looks black. Its hooked to a flat screen TV through HDMI and while blank it shows normally on that. Its rare but can happen several times in a row. Took it back to waitrose who sent it off, but they refused to do anything as its ok when they look at it. Obviously as its random I can't replicate it. It obviously could get worse in the future by which time its out of guarantee, in fact I think it is now. It runs Vista. Any ideas on what it could be or what I could do? Any advice would be appreciated.