My wifes IMAC g4 700 video has gone to three bands of white or light grey on the 15 inch screen. What caused this and how can I fix it?

Perhaps there's a loose cable, or maybe the screen is dying. If you're feeling handy, get out a screwdriver (non-magnetic!), and follow the instructions in the Apple manual to open up the iMac. Try wiggling some cables and make sure nothing's amiss.

Other than that, I'd say bring it to a computer technician and let them work on it.

Hope this helps

Be Careful for the Discharge on the tube...Zapp . Rattle, Rattle .. Nothing like the discharge from beeg capacitors, coils or ....monitors!

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