Is this a video card problem?

Hi, all.
I was waking up my MacPro(Late 2006, Quad 2.66) from screen saver and the screen froze.
and it didn't work at all so I forced shutdown and as I restarted,
The screen shows stripe-like patterns and stop proceedig aster the first apple logo disappeared.
I also tried to start in Safe mode, but it happens in the same way.
No key commands works for shut down or restart.
Anyone knows what causes this problem?
Help/comments would be appricated.
You all have a good day! ^^

what OS version are you running?
what video card, seeing you think it might be a factor?
and yes it might. you might want to boot from a backup drive and repair and/or restore the system.

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