MacBook Pro stuck at lowest frequency

hi, registered account here because had no other choice; attempts @ fixing in vain.
have macbook pro 5.1 running os x 10.6.8, , wanted undervolt using coolbook. after tinkering settings, nothing appeared change, voltages , frequencies throtteled under load. installed voodoopower didn't work, , after intelenhancedspeedstep.
latter one, managed switch frequency lowest setting , voltage well, problem can't switch frequency higher setting. uninstalled intelenhanced , coolbook frequency stuck @ lowest.
question is, how revert factory default?

 

complete

managed modify .plist load values. may close thread, thank

 

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