|I would not use the monitor anymore, it may be dangerous. The hissing could be something burning up in the monitor, or it could be some kind of short circuiting, both of which could burn your house down. First though I want to ask if there is any dust and debris inside the monitor? If the inside is clean, most likely a serious problem is occurring, and you'll want to plan to get a new monitor.|
Ask and Answer. The way of learning.
But first ask the right way.