Twice in the past 30 days my computer has been shut down because of a power failure. When rebooting the monitor will not start. The first time I disconnected the computer and set it aside, a week or so later I hooked it back up to try and see what was wrong, the monitor came on and and worked fine. Last night I was shut down due to a power failure again, and again the monitor will not start, I disconnected everything from the computer and monitor and then reconnected, monitor still won't start. Help please. Bill