Two days ago I tried to establish a dialup connection, which was not successful. The next morning when I started the laptop up I saw the message "waiting for network manager to start" followed by a second one saying it would wait an additional 60 seconds. When the startup finished I found that there were no network connections, the network connection icon stated that the network manager was not running, and the control panel had no icon for the network manager. Obviously, the network manager was somehow disabled.
This does not make me comfortable using Linux Mint 14 as a primary operating system.
I'm now running this laptop on Win7 so that I can have internet access, and the Linux Mint 14 hard drive has been set aside until I can find a way to restore the Network Manager to the startup queue. Looking at a number of blogs I see that this is a somewhat common problem.