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Unplug the power adapter from the printer. The power adapter is the rectangular black box behind the printer where the power cord is attached. Leave the power cord attached to it with the other end plugged in straight to the power outlet in the wall. Bypass any surge device or power strip. There should be a green LED light on around the adapter's contacts. If LED is off, properly secure the power cord. If that doesn't help, either the power adapter or the power cord is the problem. If LED is on, plug it in the correct position back in the printer and properly secure it. If printer won't automatically power on, press the power button. If that doesn't help, the printer itself is the problem. I suggest you contact Lexmark Technical Support to further investigate the problem.
The video inlet is not for power to be plugged in. The video inlet is for Data sharing from anther device as with a tower and a monitor.
connect power to where you see DC or AC mark ONLY.. You can distroy your LCD display module IC if you insist on doing what you are doing.
Try unplugging the power cord to your computer tower, click the power button to drain the capacitors in the mother board then plug the power cord back in and try to boot up. Has helped me repair several similar black screen problems. Chuck [email protected]