HELP!! iMac display vertical colored lines at startup!!

Hi, my iMac Intel CoreDuo 20", display vertical lines at startup and isn't possible to log-in in the system.
If I turn off and turn on the iMac many and many times, sometimes I can resolve this problem.
Does anybody knows this problem?
Is the Ati x1600 broken or the lcd monitor??
Thanks!
Here some photos of the described problem:
http://www.stefanomanca.com/imac/imac.htm
Imac Intel CoreDuo 20" Mac OS X (10.4.7) 2GB ram

But the reason is known? Is the video card broken or completely working?
thanks
Imac Intel CoreDuo 20" Mac OS X (10.4.7) 2GB ram

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