mine has been doing the same thing as many others, but I haven't seen this particular problem so forgive me if it's been asked.

 

The thing boots up, stays on between 1 and 10-12 seconds, at random. All the connections are good, and the battery, alternator, etc, are all fine too. I've got the GPS antenna unplugged.

 

I've been trying to do the service mode entry, to install 3.0, I got it once, but then it shut off right away again. The thing just won't stay powered up, so how can I possibly do anything else? This is really frustrating. Anyone with any help for me would be a lifesaver. Thanks