iPhone won't restart after installing the GT theme through Cydia

[hawaiian1]

I have a iPhone 3gs that was jailbroken before I got it. I just purchased and installed the GT theme via. Cydia and after it completed the installation it told me to reboot. I selected reboot and phone turned off. When I try to turn it on I get the apple logo and then the phone shuts down after a few seconds. I connected the phone to my PC with iTunes running and tried to start the phone but it's not recognized by iTunes.

HELP...