I have a M4400 with a number of weird problems with the screen.
On start up after the Dell logo the screen goes black and just stays black the entire time.
The keyboard lights are on and you can hear the HDD loading everything but cannot see anything.
If I attach an external monitor then I can only see the screen on that, the laptop screen stays black.
Other times when I start up instead a black screen, everything can be seen fine except everything has a deep blue filter over it which will suddenly turn to a bright pink filter then turn normal. After a few minutes it will turn blue then pink again in a cycle. Sometimes after the pink it will have a black filter so the screen is only just visible and very dark.
I have tried resetting the laptop, updating nvidia drivers and trying a Linux Live CD but I still have the same problem. What makes it worse is that when I take it back to where I bought it the problem doesn't happen and they can't see the problem to fix it.
I am not sure if this is a screen or graphics card problem, can anyone advice what it could be and how to solve it?
Thanks