Liquid Video monitor goes black after 30 seconds

Question

I have a Liquid Video E19LCD1 monitor that has worked fine for about 3 years. Now when I turn it on, it shows the desktop for about 30 sec. and then goes black. Turning it off and on, or unplugging and replugging the video cable gives exactly the same behavior (30 sec. picture, then black). Computer works fine with an old CRT monitor and the LCD monitor behaves exactly the same on a different computer. Monitor power light stays green once turned on. I removed the back of the monitor and looked for any evidence of damage or swelling of capacitors etc. but see nothing unusual. Any suggestions would be greatly appreciated!