If you are connecting to a laptop then you may need to hold the function button down and press F1, F2, F3 etc. there should be a sign with the latop on there and a sign with an external device (monitor,PROJECOR)
hope this information was useful to you.
Maybe, if you can send us the brand and exactly model, we give you clear answers.
Innitialy, must try with this:
Powering On the Projector
NOTE:
Turn on the projector before you turn on the source.
1. Remove the lens cap.
2. Ensure that the power cord and appropriate signal cable(s) are securely
connected. The power button light will blink green.
3. Press the power button to turn on the projector. The Dell logo will
be displayed for 30 seconds.
4. Turn on your source (computer, notebook, DVD, etc.). The projector
automatically detects your source.
If the "Searching for signal..."
message appears on the screen, ensure that the appropriate signal cable(s)
are securely connected.
If you are connecting multiple sources to the projector simultaneously,
press the Source button on the remote control or control panel to select the desired
source.
1 = Power button
2 = Lens cap
Powering Off the Projector
DO NOT UNPLUG THE PROJECTOR BEFORE PROPERLY SHUTTING DOWN
USING THE FOLLOWING STEPS.
1. Press the power button to turn off the projector. The "Power
Off the Lamp?" message appears on the OSD.
2. Press the power button again. The cooling fans continue to operate
for 2 minutes.
3. If the LAMP light is solid orange, replace the lamp.
4. If the TEMP light is solid orange, the projector
has overheated. The display automatically shuts down. Try turning the
display on again after the projector cools down. If the problem persists, contact Dealer.
5. If the TEMP light is blinking orange, a projector fan has failed
and the projector will automatically shut down. If this problem persists, contact Dealer.
6. Disconnect the power cord from the electrical outlet and the projector.
7. If you press the power button while the projector is running, the
"Power Off the Lamp?" message appears
on the screen. To clear the message, press any button on the control
panel or ignore the message; the message will disappear after 5 seconds.
If you have more information about your Projector, tell us.
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