Was this from HK?
For example I know I purchased the Cheap HK Camera for myself and that's worked fine, then my friends purchased the same camera and they seemed to work well also. Finally for christmas we purchased the same thing for my son and it was DOA, so I sent it back to HK and purchased another, which also turned out to be DOA. In the end I purchased a CCD camera for him from ebay. I'll post some pics of mine in the morning, hope that will help but it sounds like you've done it all ok