**Troubleshooting**
===== Nothing visible in the goggles=====
Please check the following:
  * [[biac:troubleshooting:stimulus_control_system:video:goggles:nothing_vis:electri_power | Is there electrical power coming to the goggles?]]
  * [[biac:troubleshooting:stimulus_control_system:video:goggles:nothing_vis:controlbox_on | Is the goggle control box turned on?]]
  * [[biac:troubleshooting:stimulus_control_system:video:goggles:nothing_vis:unexpectedly_turn_off | Did the goggles unexpectedly turn off?]]

If the goggle control box shows that there is power but there is still nothing visible, try turning off and on the power switch and/or unplugging and replugging the power supply.

If the screen is still blank you may need to try a different set of goggles, 
and/or get help. 



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