Flaky and unreliable

My first one ate its own power supply after a few days. Not sure what went wrong, so I exchanged it for another of the same model. Both the first one and the second one were invisible to the setup utility, but visible by using a web browser to connect to it. I installed the print utility manually on each computer in the house and then the driver for the printer I had attached (a Samsung 1710). All of my 3 Windows computers could print successfully that evening, but while my Mac could see it any attempt at printing caused the system to hang. By the next morning, however, *no* computer could print and they would each just hang when I tried. Throughout all of this the server was still accessible through a web interface. I re-installed the drivers and utilities, but it had no effect. I returned the server and will go shopping for another brand.