Skyrocket wont turn on

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http://forum.xda-developers.com – I went to a festival over the weekend and left my phone in the truck to charge up. It overheated (I think) because when I went to turn it on, it wouldn't. When I try to turn it on, it shows the "SAMSUNG" screen for a bit and then goes black and won't ever get past that point. Tried to do a hard reset but nothing shows on the screen. Also removed battery and switched it out with another one I have. I have no idea what else to try. Any suggestions are appreciated. (HowTos)