A friend asked me to fix their Virgin Mobile Venture phone. It won't do anything on battery (I believe it's dead), but when plugged in, it will usually charge for a second or two and say Hello onscreen. Then the screen turns off and back on to the Hello prompt. This cycle repeats indefinitely. They did not root the phone, however it looks a little worn down. I have attempted access with adb and fastboot, but neither display the device. When I hold Power + Volume Up, the screen goes black and Windows attempts to find a JukeB driver, to no avail on the computer or Windows Update. Any ideas?