Thought I would add this for now. I can delete it if needed. Lekky sent you a PM.
*Sorry just realized I posted this in General. My bad

*
Newb Guide to rooting the Desire and flashing an Desire HD ROM.
1. Rooting
The unrevoked method is by far the easiest. On the Mac it is really a one-click process.
On a PC you will need to do the following:
A. Uninstall HTC Sync and Doubletwist
B. Install
HBOOT drivers
C. Install
unrevoked
D. In your phone go to settings-->applications-->development Check USB Debugging
E. In your phone go to settings-->connect to pc Change default to “Charge Only”
F. Now connect your phone to your PC
G. Launch unrevoked app and follow directions
On a Mac:
A. Install unrevoked
B. In your phone go to settings-->applications-->development Check USB Debugging
C. In your phone go to settings-->connect to pc Change default to “Charge Only”
D. Now connect your phone to your Mac
E. Launch unrevoked app and follow directions
Your phone should now be rooted with clockwork recovery
You can install custom roms if wanted
2. Format your SD card to use the HD ported ROM
To be able to use the baadnwz rom which is a port of the Desire HD (along with all the nice new Sense features) you will need to partition your SD card.
There are 2 ways:
1. Download a Ubuntu live cd and boot into it to be able to use gparted to partition the SD card
2. Go here to download a
Win application to partition
Don’t use Rom Manager app to partition. It will only partition with ext2 and to a max of 512MB
Instead use the win app link to partition with an ext3 (1GB) after the main fat32 partition (all instructions are in the link-very easy to do).
*The only caveat is you may need a card reader and micro SD to SD adapter (not sure if you can partition by connecting the phone and changing connection to Disk Drive instead of charging
3. Go to Market and install Rom Manager. Create a Backup
In the app choose boot into recovery. In the recovery menu choose backup to create a Nandroid backup. DON’T skip this step. If anything goes wrong you now have a nice backup to revert back to.
Choose reboot in the menu when done
4. Install the HD Rom
I recommend the
baadnwz HD rom. Everything works perfectly except for 720p vid recording.
If you want to see all the new cool features of the new Sense go to YouTube to see what the HD has to offer.
A. Once the rom is downloaded rename the zip to update.zip
Transfer this to the root folder of the card
B. Open the Rom Manager app choose boot into recovery
C. In the Recovery menu choose "install zip from sdcard" option.
D. Now first choose "toggle signature verification" to turn off the signature check and then choose "apply sdcard:update.zip".
E. Allow the new rom to install. Once done. Choose reboot.
F. The first boot takes about 5 minutes at least. So don’t panic and just leave the phone
G. The only additional step may be to add in your carrier’s APN settings.
-To do this go Settings---> Wireless & Networks-> Mobile Networks---> Access Point Names
Press menu hard key. Add in the APN details.
When done press hard menu key and choose save.
APN list for every carrier