I see that you installed the 2.4 unlocked bootloader but did you also flash the actual ROM and radio (the radio should be the 3.27 ver). What it sounds like is happening is that you flashed the ROM but didn't flash the radio (so you are hanging at the HTC Smart Mobility screen). Eventually the backlight is timing out so that's why your screen is going black. So basically we just need to know if you flashed both the radio and the ROM.
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