SyncMaster 204b Connected to Laptop. Recognized, but black screen

I am using a Toshiba Qosmio 64x. I know the monitor works. The computer recognizes it, but I cannot get anything to display on the monitor.

I started it up today with the monitor plugged in, and the monitor displayed as my main display, but when I switched to "extend these displays", it worked briefly, then went blank. I have restarted several times trying all different settings and cannot get. it to work. Again, the computer recognizes it, but the monitor screen is black.

This is a screenshot of my display settings:

3531372db3a612df5a2fd857d7f650db.png

This is a screenshot of graphic card properties: 75547cd025710f789284bebddc13603a.png