The symptoms you describe sound as if the monitor is not receiving the DVI signal. Try pressing the 'Source' button to switch between analog and digital signals and see if this helps.
Hope someone can help me with this. I have 2 samsung syncmaster 226bw, one at my dads house and one at my mothers house. They are probably 1-2 years old. I use DVI cable with them to my computer.
Now they both stopped working almost at the exact time ! Sometimes it worked and sometimes it just swapped between 'Digital' and 'Analog' and then died. The blue power button on the screen just going on and off like no screen was detected. Then after a while it said 'check signal cable'.
So i thought something was wrong with my graphic card (4850 radeon hd 1 gb) but it was newly bought so no, don't think so.
So i tried with a new screen that uses the blue cable and used a DVI converter so i still use the DVI connection hole into my computer, and no problemas ! Why is that ? Resolution or something ? I haven't changed resolution since i bought it so i don't understand why it started mocking around.
Hope someone can help me out!