Help in solving bootloader issue

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http://forum.xda-developers.com – Please I have a peculiar problem, I pray you can assist me. I tried to root my telus dhd using advanced hack kit, after running the hack kit the phone failed to reboot. It stock at a blank bLack screen. To solve that, I mistakenly flash a froyo pd98img on a GB ROM. Since then, the phone takes about 20 to 30 minutes to boot. It will start with a splash screen and vibrate for about 10 minutes then takes another 10 minutes to boot. The problem is I can't enter boot loader and I can't use the hack kit again to return to stock since the phone won't reboot in the process. I will appreciate any help (HowTos)