Why does it no longer power on?
without more information, I can only give you some simple checks.
First check your fuses located near the input of your power cord. check for a blown fuse.
second, the power switch itself may be damaged, you will more than likely need an appliance technician to check that.
third, the monitor may have just quit working all together.
it would be best if you are not comfortable with checking these things yourself, to take to a repair person.
on Jun 15, 2015