Black line at the left side of monitor

There should be a menu option on the monitor it self. press the menu option and configure the size and position option to adjust the screen display. That should resolve your complication.

try to clean the laserwindows of the printer.

screen back light on the other side is busted which need replacement.

You can try resetting the monitor to factory settings. Normally a button that brings up a menu to do that.
You might want to check the system with another monitor just as a comparison to see if it is the monitor.
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If the lines are parmanent, Then suspected part is LCD Panel.

i found the users manual

This is a bad panel. The panel is very expensive to replace. It would be cheaper to buy a new tv. Sorry about the bad news.

The Black Wires from the md26 are your load(the heater) and the red lines are your line(power). The lines are also paired up on the thermostat with a red and black on the left and are red and black on the right. In the actual heater connect the black to the black wire and the white to the white and connect the grounds. In the thermostat connect the black from the heater to left side black( remember there are pairs left(black, red) right (black, red) and the white to the right side black connect the black from your power to the left side red and the white from your power to the right side red. Should be ready to go.

You'll need to look at

Drum Unit - these can go beyond their rated life

Transfer Belt - these can fail suddenly and dramatically, often quite soon after their rated life is reached.

Also check Transfer Roller (open the duplexer door to see this - grey (black when new) foam roller about 25mm diameter purple plastic tabs on ends (1 may be black). This is critical to good quality prints, as it maintains the contact between paper and Transfer Belt AND electrostatically pulls the toner off the Transfer Belt onto the paper.

if you have a status monitor installed, then you can choose from there replace bk toner and printer will turn the right toner in right place if not, then open front door remove waste toner box, locate about 1 cm usually crey ring knob, in left upper position, use screwdriver or something to push it then you can easily rotate the toner rack to the left, and pick a needed color.