Are you sure the monitor has the problem and not the system? If the system doesn't provide a signal, the monitor will stay in sleep mode.
Try the monitor on a different system (that works) in order to get a "second opinion".
i've tried it on 3 different computer and other monitors work with those computers and not this one. and when i use it as a secondary monitor to a computer that's already on it show the desktop background for 5 seconds then says " going to sleep" and shuts off.