I had this same problem about a month ago. When I would turn it on, the power light would come on but the go out after a few seconds. I figured I would try new batteries and as I was taking them out, I noticed one was not in correctly. You might want to double check, you never know.
Btw, as someone said, you can call their tech support number and get a guy on the phone in a matter of a minute. They are good guys and really try to help. I've called them on a couple of other issues and they helped over the phone.