Optoma GT750E User Manual page 43

Steady light 
No light 
The projector stops responding to all controls
If possible, turn off the projector, then unplug the power cord and

wait at least 60 seconds before reconnecting power.
Check that "Keypad Lock" is not activated by trying to control the

projector with the remote control.
Lamp burns out or makes a popping sound
When the lamp reaches its end of life, it will burn out and may

make a loud popping sound. If this happens, the projector will not
turn on until the lamp module has been replaced. To replace the
lamp, follow the procedures in the "Replacing the Lamp" section on
pages 44-45.
LED lighting message
Message
Standby State
(Input power cord)
Power on (Warming)
Lamp lighting
Power off (Cooling)
Error (Over Temp.)
Error (Fan fail)
Error (Lamp fail)
＊ ON/STANDBY LED be ON when OSD appears, be OFF when OSD disappears.
Appendices
ON/STANDBY
Temp-LED
LED
(Green/Amber)
Amber
Flashing
Green
Green
Flashing
Green
Flashing
Amber
Flashing
Amber
Flashing
Amber
Lamp-LED
(Red) (Red)
Flashing
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