Screen flickers then goes black

Hello. Having a problem with the display on our 15" 1.25 G-4. After using it awhile, the screen starts looking like a strobe light then goes to all black. Closing the lid, letting it sleep for a bit waking later will then get it working. I've reset the PMMU, but haven't run the hardware checks because the disks are gone.
Any thoughts? Hardware? Driver?
Thanks

I suspect that it could be the inverter board which controls the backlight. I just had mine replaced after similar symptoms.

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    Make a Genius appointment. Troubleshooting and analysis are a free service at the Genius Bar. If don't have Apple Care and you need repair, then you would have to pay.
    http://www.apple.com/retail/geniusbar/
    Before you do costly repairs on an old Mac compare it to the cost of a new MacBook Air. Apple recently dropped the prices on the MacBook Airs by $100. Best Buy has been offering additional discounts on the Air. Prices start around $850.
    http://store.apple.com/us/buy-mac/macbook-air
    If you do purchase a new computer, get 8GB RAM. RAM is soldered in and you can't upgrade later.
    Check out Apple's Special Financing link.
    http://store.apple.com/us/browse/finance/instant_credit

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