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I am an idiot, first and foremost. I was running an older version of CM7 and just bought an Evo 3D. I decided to sell my Evo 4G online, and went to unroot it. I ran the original software RUU (1.06.651.4) on the phone, (because I am dumb and didn't think things through) and now it is semi-bricked. Symptoms: The phone turns on with only a black screen (it is "lit up" but nothing appears on the screen). The phone vibrates once, then the phone plays a sound (a little tune) to indicate it is booting up. The phone plays a sound to indicate a low battery warning. The phone plays a sound to indicate when I connect the USB cable to it. If I try to boot to bootloader by holding Vol-Down when powering up, the black screen appears with no sound and no further action. If I try to re-run the RUU, or run a different RUU, I get a USB Connection Error. I can't run an RUU, I can't flash anything because I have no access to Recovery, etc. Can anyone help fix my stupidity? I shouldn't have rushed into unrooting. Damnit.

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The main thing you need to do is get in to the recovery. I am not sure how to do that as I don't own the device. You can try using ADB and do 'adb reboot recovery'. –  Ryan Conrad Jul 3 '11 at 2:59
    
he cant use adb if he cant boot the OS. fastboot would be a better solution –  Gautham C. Dec 30 '11 at 18:20

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Happened to me one on my DHD my phone had same symptoms what i did was take the batttery out then Hold the power button and then insert the battery into the phone again (while holding the power button down/ pushing) and my phone rebooted into bootloader and from there i switched to recovery hope this trick will work for you. good luck

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