Unplug the unit from the wall overnight. Plug back in and see if it works. Sometimes Logic ICs get "stuck" and this will reset them.
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As is the case with all A/V gear, if it's fairly new but out of warranty, try to get it repaired first (no need to throw away good gear that just needs a tune-up), but if it's going to cost more than a couple hundred bucks, I'd take the stance that it doesn't make good sense to reinvest in old tech when you can just apply that amount towards something new and cutting edge. If you can't breath new life into your AV8801 and you decide to upgrade, let me know - I run a HT company out of Atlanta that serves customers nationwide, and would be happy to help you find a suitable replacement.
President - Southern A/V Direct, LLC