Using a program that wipes the partitions of other phones isn't a good idea... the partition tables for every phone are different and what could have been the system and boot partitions for the G1 could be the bootloader and recovery partitions for the HD. Since there is absolutely no response from the phone whatsoever I would say its a bootloader brick, I've only had that when I deleted the bootloader on my dads S2.
EDIT: 2K posts!