My iphone wont turn back on.?

I have a Iphone 3G. I unlocked & jailbroke it with blackra1n a few months back. I plugged it in itunes 2days ago to see if theres an update for it, which there was. I was in the process of updating it, but my wife unplugged it while it was still in progress. Now the screen displays the cd with the itunes cable with the "Slide for Emergency" bar on the bottom. (You know, the bar the changes languages?)i went on youtube to try to get it back, but it wont. i followed directions to get the phone out of recovery mode, and i got nothing. directions to get the phone out of dfu mode and i got nothing. i tried the recovery on on itunes and it goes thru the process. once its done, it goes back to the same thing (cd, itunes cable, slide on the bottom of the phone.) Is everything erased on my phone? I have tmobile service. can someone please help me????