this video will fix your iPhone, iPod, iPad, stuck on Apple logo without computer and without restoring wich can happen after jailbreak. if you follow these directions correctly.
No computer needed and no restore
First press and hold home and sleep buttons till screen flashes black
then let go of them and press sleep and volume up button as fast as possible,
as soon as you see apple logo appear release home button while holding volume up button till slide to unlock appears… Thank you