Hello,
The line in the middle of the page is caused by a damaged or worn fusing assembly in the printer. Here is a link to an article showing this issue on the Laserjet 2100 printer and how to replace the fuser unit. Your printer just needs to have the fuser replaced, it is part number RM1-6405 and is available from Amazon
http://www.ccl-la.com/blog/index.php/how-to-fix-hp-laserjet-2100-vertical-lines-on-print/
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