Function buttons stopped working on my Titan

[brockmo]

So just today I go to make a phone call (HTC P4000 - Canadian CDMA Titan) by hitting the button and nothing happened. I reboot, again nothing happened. I did not make any software changes or drop the phone at all yesterday. It just randomly stopped working. After further testing, the jog wheel works (along with the click on the jog wheel), the directional pad in the middle of buttons below screen (along with the click) works, and the power button on the side (to turn screen off, or hold to be prompted for reboot) works. Everything else does not: the IE and messaging button at the top above the screen, the 2 function keys below the screen, as well as the windows and OK button below that. ALSO along the sides of the phone all buttons do not work (comm manager, camera, voice record, ok.... power does work though keep in mind).

Does this sound like a physical issue or possible software or OS corruption of some sort? What is bizarre to me is that the OK button along the side works, yet the button right below it (comm manager) does not work. It would make sense that this button (the power) would be wired differently as it's more essential i suppose. What are your thoughts? Anything I should try or does this sound 100% like hardware... if it is that's ok cuz I have a warranty through my carrier for the entire length of my contract. Thanks for any tips or advice in advance!