A technical question

Completely unrelated to the topic of crosswords:

I have a lovely LCD monitor, a 19" Princeton brand I bought at Costco two or three years ago. For the last few months, it's been possessed. When it's supposed to switch to power-save mode and go dark, instead it glows white. When I press the power button to turn it off, it glows white. The only way to make the screen actually turn off is to unplug the beast. Short of a technological exorcism, what can I do to remedy this?