As far as i know there are three types of boot modes for the iPhone.

1) Normal boot into operating system
2) DFU mode showing iTunes logo
3) DFU mode with blank black / white screen

Anyone care to elaborate on these different types of boot up mode? The only thing i know about 2 & 3 is that if you try to restore from 1.1.1 to 1.0.2 in mode 2 then you'll receive Error 1. But if you change to mode 3 then this error doesn't appear. Strange...

Cheers.

How to:

Normal Boot - Press power(top) button
DFU Mode - While phone is turned on hold power(top) button and home button for ten seconds after ten seconds release power(top) button and hold the home button for ten more seconds

I think there is only one type of DFU mode though...

Edit: You may be thinking of when iTunes makes you restore your phone because of an error, but I don't think you can manually do that... Or there is no difference and it just does what it does... Dunno though.

Yeah i know how to put the phone in restore mode. But there definitely is two modes of restore. One is where the iTunes logo is shown the other shows nothing on the screen but if you plug the phone to a computer iTunes will indicate that the phone is in restore mode.

Originally Posted by JungleJim

Yeah i know how to put the phone in restore mode. But there definitely is two modes of restore. One is where the iTunes logo is shown the other shows nothing on the screen but if you plug the phone to a computer iTunes will indicate that the phone is in restore mode.

You are right about that. You only can do some restorings (1.0.2 in example) with the black screen dfu mode :p