So the OS did load without issue but failed to boot. Are there any error numbers? are you sure the OS is the proper one for the model phone and it is the one offered by your carrier? A clean OS load should work.
This link is on the forum for a copy of the 9900 OS
General 9900 Series Discussion - Bold Touch - BlackBerry Forums Support Community
ZombieBerry also has instructions and an old OS version you can try.