Not enough voltage I guess, I have seen something similar to that. Glad you worked it out. But yes, try to stay away from inkjets, laser is the way to go. For black/white printing you want to look at the 2000 or higher series, if you need a reliable color printer for multiple users, look at the 4000 colors. Much more expensive, but they have a solid duty cycle to work well in an office environment.
Matt J.
Please always take the time to backup any and all data before performing any actions suggested for ANY problem, regardless of how minor a change it might seem. Also test the backup to make sure it is intact.