HELP!! Phone is Shutting Off

My Impression was working great and all of a sudden it shuts off with full battery. When you turn it on it does one of two things.

The att boot screen plays through and immediately the att shut down plays and the phone freezes on the Goodbye screen.

If I slide the phone open and turn it on, the phone boots all the way, updates the time and within 15secs shuts off and freezes at the Goodbye screen.

Anyone have any ideas??

yes is does the same thing while plugged in.

well the problem is, the phone doesnt stay on long enough to do a factory reset. It shows the att boot then imediately shows the shut down and then freezes at goodbye when it gets all the way in you have 10secs tops before it shuts down and freezes at the goodbye screen.

So I am guessing that either a reset or flash isnt going to work?

So, wierd thing is, if I hold down the power button while the phone boots, it will boot all the way and stay on and I can even text. Any time you mess with the power button or do anything intensive blue tooth/games/apps/make a call it shuts down and freezes at Goodbye. I guess I will try to do a reset and see what that yields. Any more ideas?

*Update* Everytime I  went to menu/settings/reset settings/phone and put in the password, as soon as I pushed ok the phone would shut down and freeze at goodbye. I finaly got it and it said your phone will be reset and restart. Upon restart the boot screen came up and then it shut off and froze at the goodbye screen.

Holding the volume button and power button does nothing and then eventualy it shuts off and freezes at the goodbye screen.

*Update 2* I got the phone to make a call and everything went as normal. When I pushed the power button to end the call it ended and went to the home screen. No none of the physical buttons work or the touch screen until I pull the battery and restart it.

I should also note that when it shuts down and freezes at the goodbye screen I have to pull the battery to shut it completely off. When I put the battery back in the phone automaticaly starts itself.

The phone was given to me. I replaced the flex cable and the phone has had no issues for 2 months until now >.<

Going to flash it I guess, I already took it apart and everything was clean and connected the way I left it.

At this point I would have to say it's hardware related and I really don't have any other suggestions for you. Sorry

I know this thread is long and things were looking grim but I hope I still get some action here. So I figured I would give the phone a break for a some days and check back on it.

The phone almost completely works (Games, calls, texting, internet, physical buttons including the power button, touch screen, everything works) except for one wierd minor issue.

The last and final quirk, when I hold the power button to turn it off, it shuts down and what I thought was freezing on the Goodbye screen is now just sitting on the Goodbye screen. It just sits there, if I hold the power button again the phone will quickly turn off and then boot back up.

What do you think would keep it from shutting completely off?