apehater: could you exclude the possibility that just the contacts between laptop mainboard/gfx and display are broken? if you start it and wait about 10 minutes, do you hear any windows start sounds?
otherwise it sounds like a serious problem, i'd say most probably something on the mainboard with onboard gfx (never had a case where cpu or ram were broken). such cases are hard to repair and cause laptop cpu, mainboard and probably ram are soldered together, repair shop would end up replacing the cpu/mainboard/ram thing. i assume that this isn't cheap.
Yeah, it's definitely not just the screen or connections because it makes no attempt to start Windows normally.
Pretty much...
So. I've picked the laptop back up from the people who were looking at it.. and as far as I can tell they made no attempt to open the bottom and look inside, so presumably they've just guessed it's the motherboard from the behaviour when you switch it on (quite frankly I could do that myself and you guys had all guessed the same without even seeing it, though at least it was a free service..).
Are any of the other possibilities mentioned here (damaged connections, graphics card or processor failing etc.) likely to be cheaper or easier to fix than getting a new motherboard?
Should I pursue it further in case it's not the whole motherboard that's the problem?
The shop said they couldn't find a new board for my specific model and wouldn't advise using a second hand one as it may just break again pretty quickly (which makes sense), and the last motherboard they'd replaced in a laptop cost £260+
I'm leaning towards getting a new one, but if there's any chance of getting this one fixed for less than £100 I'd probably do that...
I haven't brought it anywhere else for a second opinion because when I phoned the other place I was thinking of trying they basically said the same thing (if it was the motherboard then not to even bother as it's cheaper / better to get a new one).