Need Help, MY SCREEN STAYS IN LANDSCAPE MODE!!!!

[MR SLIMM]

My screen is stuck in landscape mode, and it will not go to the today screen. It just shows 6 different icons for different programs. This is the original software. No tweaks or upgrades have been installed. It is Windows Mobile 6.1 Professional. CE OS 5.2.19965 (BUILD 19965.1.2.3). Has anyone had this problem, or know how to solve it? I'm thinking it may be a hardware issue, but I was wondering if I try and reload the software, maybe it would go away. By the way, anyone know where I can find this software, I did a search, but was not able to find it. Help would be really appreciated.