A first I thought it was a software problem, then a dust bunnies in the tower problem, then I realized the machine made the right noises logging on, etc.
So I turned my attention to the monitor. For awhile I could get it to work by laying it flat on its back and tapping it w/ a screwdriver.
Then this morning that stopped working.
Now it seems to be working perfectly -- why I'm posting here -- and slapping it doesn't seem to send it back to blurry mode.
One interesting aspect about the monitor when it's _not_ working: it puts out a sine wave hum with a frequency about middle C.
Bret Cahill