I had the same issue along with my issues listed Multiple Display and Resolution issues also no one replied, but I don't mind if people don't have a fix. It ended up Not fixable and was in fact a bad Monitor. I fought and fought for 14 hours trying everything I read to fix the issue but it comes down to it being the most dreaded the monitor. I ended up taking it back to the store and I bought the store warranty. I will always buy a store warranty on everything I buy like this. Not only did I get a better monitor I got a 80 dollar free DVI cable since there wasn't one in the box.

Dont feel bad if people don't awnser your question I assure you out of the 28 or so people that read your post I am sure several spent time searching for an answer for you.

I did search but I didn't find an answer that sounded good to me with out knowing more info.
First what monitor is it? What kinda cable are you using a DVI cable, VGA, or are you using an DVI adapter? When it says No Signal does it also say No Digital or switch to Analog?