Help!! m9750 infinite boot loop!!!!

Hi Guys

So there is the problem. My wife went to turn on my m9750 a week ago to watch a movie as we usually hook it up to the plasma to watch hd video and it did something quite odd. Now it has done this in the past but has always resolved itself but now no joy. Basically what it is doing is it will post the led head and media bar led's come on and the drives and other hardware spin up but after about 5-6 seconds the laptop powers off and it tries to boot up again but no joy and it will do this for hours if I let it. Anyone have any ideas??? I have pulled it most the way apart but still haven't seen anything strange and have tested it with other ram. Unfortunately I have a cammed out screw on the northbridge/ main gpu heatsink so I have to use a screw extractor before I can finish pulling it apart. any help of suggestions would be greatly appreciated. Before this it was working fine and hadn't done this in probably 6-7 months. also could this have anything to do with a bad cmos battery because I am pretty sure mine is dead because if I unplug it and remove the battery in the past I have to enter the bios and reset all the settings and time. Thanks!!

 

If it's doing it's POST and then 'restarting' sounds like it's trying to boot windows and either BSODing or something similar, returning it to the POST screen.

Have you tried booting into safe mode?

Sorry if i've misunderstood and it's not even getting that far.

 

No its not even getting that far it starts to post but I get no display at all just the inital fan spinup and hardware power up. Once I get that stripped screw out I will try the video card in the other slot. I know its not the gpu because it did this when I used to have a 8700m in it but now I am using a 7950gtx.