Think i have a problem with my Video card help ???

Hi Guys
Ok reason why i think this i currently have a black screen
I can still use the mac via screen share from my G5 so i know all is ok & i am currently making sure i'm backing up
I have tried to connect it to an external monitor but the mac doesn't register that there is one there
One other strange problem i can type ok but i cannot use my trackpad while i am in screen sharing mode
Any help would be great
Thank You

Well it's either your graphics card or the inverter for the screen I'd guess - either way the only people who can fix this for you are Apple.
The fact that it doesn't see an external monitor would suggest it's the card ...
I know this might sound like a dumb question but you have turned the brightness up fully and tried a PRAM reset haven't you ?
Parameter RAM reset - hold down command/option/p/r keys at start up and wait for three chimes before releasing the keys.

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