Black & White Vertical Bands on Freeze

For the past few weeks my eMac has been randomly freezing and the display is filled with thick black & white vertical bands/lines. The applications seem to be running in the background when this happens (iTunes was still playing) but I have to hold the power button to shutdown the computer as it won't display anything on screen other than the black & white bands.
Does anyone know what this is/how I can fix it?
Thanks

The symptoms you describe of one of a set of many which may indicate that your eMac 1 GHz or 1.25 GHz machine uses a logic board on which there are defective capacitors.
To determine if this is the case with your logic board, you may remove the user access place on the underside of your machine and inspect the visible capacitors. Affected boards typically will show evidence of swelling, bloating or leakage of fluid from the capacitors.
While Apple once covered the replacement of such logic boards, the repair extension authorization for this issue expired long ago. You can alternatively have your logic board repaired if it is affected by this defect. Contact me at the electronic mail address listed in my Public Profile if you are affected and want to explore such an alternative.

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