Graphic Card crashing, computer won't start

Hello,

I am having some problems with the computer, and I think it may have something to do with graphic card. Here is what is happening:

1) When the computer starts up, it looks different than usual and the information does not display correctly, as seen here:




2) When the computer does start up, within a few minutes the screen will keep flickering to black and gives the message "Your display driver stopped responding and has recovered", this will repeat a few times until I get the blue screen.

3) Now after a few days of this problem, the computer sometimes does turn on but in the wrong resolution, there are strange pixels running across the screen and it won't recognise my second monitor. In fact it doesn't seem to recognise the graphic card at all?

I got new RAM about a month ago and not sure if this is part of the problem, everything was working fine until a few days ago. My computer specs are

Intel Core i7 CPU 920 @ 2.67 GHz 2.66 GHz
16 GB RAM
64-bit windows 7
NVIDIA GeForce (not sure the exact model as the computer doesn't seem to recognise it at the moment)

Could anyone give advice to what I can do to solve the issue?