Returning to grey screen at startup issue

I have started up my G4 powerbook and am met with a blank grey screen.

I had previously been using the laptop for connecting to a projector for a presentation and having been met with this problem I reconnected the laptop to a projector and the image of the desktop was viewable on the projector screen and thus I could manage the laptop via this. How can I get the screen on the laptop back to where it should be that I can see the what I am doing?

I am sure its something obvious and possibly relating to screen sharing or such like but I cannot think of the solution just now. Any thoughts?

After a moments clarity I realise that I had in fact a dvi monitor which I have connected the laptop up to so it is now easier for me to see if I can try to resolve this.

When connected to the monitor then I can use the laptop and manage the system preferences etc. When I do the display mirroring then the image is not switching between the default monitor view and the laptop desktop but just changes to different screen size with the same image.

Does this make sense?

Here is what I see in the info about the G4

The graphic card is still recognised. Could it be that the actual connection between the graphics card and the actual screen is blown? Any insights would help.