MacBook Pro and Sow Leopard video problem

When I connect MacBook Pro using Snow Leopard to LCD projector, the projected image is very problematic. Two symptoms. First, the video has a flicker to it. Second. menu lists have overlapping double and triple images so they cannot be selected accurately. The result is that demonstrations of sofware such as Final Cut pro cannot be done effectviely. Does this sound like a vieocard giving up and needing logic board replacement?

Thanks for your reply.
In the Print and Scan Preference how many printers do you have installed? - one.
If only one which I assume is USB, try installing the Cannon as a network printer. - It doesn't specify that it is connected by USB. It says that it is "in use, Default". There is a tick in the box alongside "Share this printer on the network". Is there somewhere else that I need to access to install it as a network printer?
If you have already installed it as a network printer  open the print queue from the Print and Scan. Click on the Printer Menu and run Netwrok Diagnostics.
I entered the print queue but there is no option to click on Network Diagnostics because it is greyed out.
There are tick boxes alongside:
Screen sharing
File sharing
Printer sharing
Scanner sharing
Remote login
Remotemanagement
Remote Apple events
Internet sharing
Bluetooth sharing
with a tick alongside Printer sharing.
Many thanks.

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