Dead Mamba XL?

[LiqrSicc]

Little help here guys. I converted an Losi XXL to brushless last month with a 1717 and a MMM. Ran fine for a few weeks and one day it just wouldn't turn on. Ok, no biggie. I got a used Mamba XL on eBay a few weeks ago. Powered on and worked fine. Took it to the park this afternoon for it's first run since the new ESC. Ran for about 30 seconds then just died. WTH. Swapped lipos and no change. Didn't even get a spark when connecting the battery. The fan is running and the servo still turns. Took it home and tried other batteries. Still nothing. Unplugged everything and just had the ESC on the RX. Still nothing. Had just about given up but decided to connect to Castle Link and for some reason it connected. The software noticed the Mamba XL was connected. Even updated firmware. Saved the settings and tried to plug in the battery. Same thing. I give up. Any suggestions?