Lenovo T400 / T500 :: T510 Dual Monitors No Longer Working Properly

I have a T510 running Win7 64-bit.  For at least 3 years, I have had the same dual monitor setup (2 DoubleSight DS-1900S) running off my minidock with the laptop closed.  The rgith monitor is the primary, running off the DVI port, while the left uses the analog port.  I was away for a week at Scout camp, powered on the system once while I was there, and when I came back to the office, my monitor setup started failing. 
 
Specifically, the right screen is active but it no longer displays the signal being sent to it.  When I powercycle the screen, I can see the display for about a quarter of a second, then it goes blank.  When the problem first started, I could cycle it about 20 times and eventually it would stay on, until I left the unit overnight and it went to sleep, at which point the probelm started again.
 
Sounds like a wonky monitor?  I have a backup set of monitors that I swapped in, and had the same exact problem, so that appears to rule out a mechanical defect.  More fun facts: I can only use the laptop screen as a standalone display.  I cannot get the multidisplay control panel to open, even though my left screen is powered up.  However, one of my programs that normally launches to my right (main) screen will still launch, but not to my laptop screen.  It really wants to live on my right screen, even when that screen is not powered on (I can close the program by accessing the icon bar at the bottom of my laptop screen).