Allot of times these things have internal fuses that you can replace even
thought the outside says "no user serviceable parts inside". Judging by the
fact that it still turns on though and gives an error leads me to believe
it's a more serious problem. I'd crack it open anyway before running out to
buy a new one.

It little tip on power inverters. Try to get ones that produced a good sine
wave like real AC if you are going to be using for sensitive equipment like
DVD's, computers. The cheap ones create AC current that looks like this
_|-|_|-|_

:)

Bryan