White screen black apple on iphone 4s?

I tried to update the software on my iPhone 4s and now it just keeps turning off and on and it gets stuck on a white screen with a black apple on it when it finally turns back on. Any ideas of what I can do? I can't restore it due to some settings on my actual phone that I obviously can't get into, any other ideas?

Start the iPhone in DFU mode (plug into computer first) and restore.

This will erase all your data unless you have backed up your iPhone with iTunes.