The LOC light indicates the front panel lock is on. This keeps you from starting the oven when cleaning the panel; it also keeps children from turning on the oven. To disable the lock, press and hold Bake and Broil Hi/Lo together for 2+ seconds until SF appears on the display. Then press Self Clean. Then press Start to exit the Special Functions menu.
GE appliance manuals are available from their site. Go to http://www.geappliances.com/service_and_support/literature/
and enter the model number of the appliance. Then click Search.
I hope this helps.