So is the phone working right now? If you got the phone less than a week ago, it will have HBOOT 2.02 or 2.10. Using the Unrevoked method on it will not work and you probably just erased your 4G RSA key since Unrevoked isn't coded for those partitions.
This is the tutorial you need to use is if you have HBOOT 2.02 or 2.10:
[ROOT][GUIDE] HBoot 2.02/2.10 SOFF - The Savior Edition - Upd. 12.26.10 - xda-developers
Edit- I'm hoping when you used the Unrevoked method it didn't wipe out the RSA key. Once you verify your HBOOT version (I'm assuming it is 2.02 or 2.10), use the tutorial above and get it rooted.