Can you link to this "as many suggests" information that leads you to believe that your monitor had its firmware corrupted so that installing the same again would make a difference?
Do you know of any event that would have been likely to cause firmware corruption?
If not, I suspect either the mainboard or power supply in it has failed. I would first look at the capacitors on the power supply board or power regulation section of the mainboard, may be vented as this is a common monitor fault.
Otherwise, no I don't know of a way to install the same firmware. You could research whether there's a hidden service menu accessed by holding down some button combination when it's powered on, but as mentioned above I doubt that will help, and if it's not displaying anything on the black screen, would be kind of hard to see the service menu, if there even is one.