Did I fry my sidewinder?

[monkeyracer]

I went out with my Rally truck (3s lipo with 21t brushed motor) for a quick bash session and was having an awesome time when the truck just stopped. I figured it was just the LVC and packed up and came home. Tried a different battery and nothing still...

So, I hooked it up to the castle link to see if it would respond, and everything worked fine there, connects no problem, accepted settings changes, etc.

I hooked it back up in the truck, and still get nothing. Changed the tx batteries (because they were low) and still nothing.

When I plug a battery in, I get a VERY faint red led. No change with throttle input (so it won't allow recalibrating.)

So what is wierd is that it works with the castle link, but that's all it does.

Any suggestions on what else to try? Should I just send it back to castle for non-warranty work?