Beeps when turned on and displays "F1 ...System Information" at lower left of screen. If left for a moment or two it then displays the said information at the upper left with the option to press ESC to continue. Pressing ESC then loads Windows 7. I have noticed that when typing that using the left Shift key and C does not enter anything whereas its fine using the right shift key. Other keys and left shift appear to work ok not that I have checked them all.
Reset the BIOS to defaults, also try to unplug the keyboard and use an external one, see if that helps. The fact that you have a funny issue with a key or two shows that the system may be reading a key press, either bad keyboard or connection on the motherboard.