Why is my iphone not going back to the home screen?

I have an iphone 4g 8gb with iOS 5.1.1 jailbreak on it. After about a year and a half i got sick of the old jailbreak and decided it was time to update. Well i didn't have enough memory on my phone to update so i went to settings and had it erase all files and data. After I pressed it it went black and all it showed was the loading wheel. Its been doing this for 12 hours. I tried syncing it w/ itunes but it won't read it. My power button's broken so i can't put it in DFU mode. Any ideas?

Apple.

Apple.

Apple.

1. Restore with itunes. Often the best way to solve an iOS device issue.

2. If you can't find a solution online or restoring doesn't do anything, take it to an apple repair center.

get professional help.

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