Have you checked the fuse on the plug?
Do you have another power cord lead you can swap over to see if this works?
Also make sure the printer is not in Sleep Mode (Flashing Power LED Light).
If it is, unplug from the wall, wait 30 secs and then plug everything back in and restart.
Have you recently installed any software updates. If you have, you may need to update the 'printer driver' software, available from the Lexmark website.
Failing that, I'm snookered. Gook luck.