It’s the CCD chip, and if you start searching that out on the web, you’ll find you’re not alone. My zr70 – purchased in the fall of 2003, “blacked out” last month.
If you e-mail canon support, they’ll give you a lot of BS troubleshooting (even though they know what the problem is) and then they’ll tell you to mail it to California or New Jersey.
I’m in the process of e-mailing them back so they can tell me what they charge for this fix. Someone on another site estimates $240. I paid about $550 for mine, and I sure as hell am not going to put $240 into it when I can buy a new one.