Originally Posted by Mile_zdr
Change the recovery to 4ext latest 126.96.36.199 rc1 ,format everything except sd card from recovery after that enable smartflash and flash Rom,if doesn't boot up again you'll need to flash boot.img from pc via fastboot
Sent from my HTCSensation using xda app-developers app
I finally figured it out.
After flashing the rom, have to flash the boot.img (inside the rom zip file) as well, using the command:
fastboot flash boot boot.img
Now I'm able to boot into MIUI and enjoy the new rom!
I never have to do this extra step with flashing my Desire HD, not sure why it doesn't work this time.
Anyway, thanks for your help