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DLP4500:When the DLP4500 is turned on

Part Number: DLP4500

When the DMD is removed from the DLP4500, you will see two LEDs near the DMD, one green and one red, when the power is turned on. When correct, the LED is green, but does this mean that the LED is red when the DMD is not recognized? Or does the LED turn red when there is some other problem? Please tell me.