This is what I know from what he remembers he did to the phone. He said that the phone started t only boot to the Sony logo and then it would hang until the battery died or the phone was reset. If plugged in with a wall charger then it would allow him to get to the screen where he would enter his password but the touch screen wouldn't work. He then flashed it using Flashtool and at that point it would boot to a black screen and that's it.
-It hangs on a black screen, no logo or anything is present and it happens regardless of whether it is plugged into a wall charger or not.
-It is not found when plugged into the USB port (Windows 7 PC) and shows up as an unknown device. After a few minutes it is found by the PC but sometimes will randomly go back to an unknown device.
-I sometimes get a red light which blinks three times when I press the power button on the phone. I am currently charging it to see if it was a matter of being a dead battery or something worse (I heard it could be a hardware failure).
Any suggestions would be appreciated.