Help I droped my diamond and now screen acting crazy
 

I droped my htc diamond on the pavement and at first I thought it was totally dead because when I reset it and connected it to the charger it wouldn't turn on but I felt it vibrate. Then after messing with it for a bit if I found out that if I hold down the talk or home button I could see the screen and it works fine as long as Im holding the button down. Also none of the hard buttons work ie... talk, end, home, back, and middle button.

So does anyone know what part I would need to buy to fix this? I think that maybe something inside broke or is loose but not sure.

Any help would be appreciated ... Thanks so much...

BTW I have Mighty rom installed.