Imac g4 won't boot - odd band appears on screen

Computer was in sleep mode. Cannot boot from install disk. Below are 3 images showing the progression when I turn it on. I reset the PRAM or whatever it's called, to no avail. Options?

Does it sound/feel like it's starting up anyway?
It would appear to be the Video card at this point, but have you blown the dust out lately?

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