I have a Dell OptiPlex 3040 cpu and Dell monitor E2210c and my monitor will not wake up from sleep mode after sitting for long periods. I have to unplug the power source from the monitor several times before I can resume working. My boss is having the same trouble with her monitor. Do you have a solution for this troubling matter?
Have you taken these 2009 E2210 monitors and tested both the DVI in port and VGA in port? And then tested both monitors on a different computer (other than yours and your bosses) ? When you run the standalone Built-in Diagnostics (page 31) to see if they stay on during the test?