iPhone 3GS jailbreak problem.. Help!

[Ginahr]

So i jailbreaked my phone and it worked. I then downloaded a theme, and when it was downloaded i also suddenly had Winterboard. So I clicked on winterboard, and it said that I had to reboot my phone or something. I did that, and now it wont turn on! It just shows the apple-sign. It showed the apple sign until it was out of battery, and when I plugged it in, it only showed the apple sign again. I can't do anything with my phone!!

Does anyone know what I can do?
PLEASE HELP!

 

[Ginahr]

Also, when I plug the phone in the computer, it does not show in iTunes :S

 

[Thomasjtsi]

Sounds to me like you're on a tethered Jailbreak w/ iOS version 5.0 or 5.0.1. Is this correct? If so, you need to connect your phone to the computer your did the Jailbreak w/... put your phone into DFU mode and "Just Boot" from the redsn0w control panel.