I just had this problem. Same monitor (w2207h), connected to my laptop. I don't know what brought it on, but one day I just couldn't stop it from going to sleep as soon as it was connected to the laptop. Couldn't access the monitor front panal control buttons; screwing with the laptops display settings didn't work; system restore, nothing. My laptop was able to recognize the monitor, but the **bleep** thing just wouldn't wake up.
Eventually, at my wit's end, I yanked the power cord out of the monitor, waited a few seconds, then plugged it back in. Voilà! The monitor sprang right to life.
I hope the solution is so simple for someone else.