If that doesn't work could also be a super-dead battery. If its down to 0% it will shut off the radios but still turn on. For a little bit anyways. If its neither of these suggestions, I don't know what it could be....
Posted from my CrackBerry at wapforums.crackberry.com
If that dont works,, fully charge your device(shuted down), and retry... You can remove your battery too, that reboot the phone and fix a lot of software problems.