Dead graphics card?  machine still fine otherwise?

Hi all,
I have a 1.5ghz PB 12 that I put to sleep one afternoon. When I woke it up later, the display did not come up.
I grabbed a flash-light and shone on the display, but didn't see anything there.
The machine is still up, responds to ping, ssh & vnc just fine.
So I vnc'd in, looked at the System Profiler and the Graphics/Displays section displays "No information found".
Is there any way to make the machine realise it really does have a graphics card?
Thanks!

Hi and thank you for the welcome; I wish it were better circumstances, but still
I did do a PRAM reset, as well as the PMU reset, and neither made a difference.
I'd love to do the hardware tests, but as I can't see anything on the display (or even any external displays) I don't know how to run them, or how to see what they would output.. (I only know of booting from the CD drive to run them--is there a different way?)
I don't know if this would make any difference, but I did recently put Leopard on the machine.
Thanks!

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