There goes that Broni -- keeping me honest, again...
I threw out that sentence on the likelihood of a cathode ray tube (CRT) monitor working in 2008, if left on, will probably not "burn in" an image if the image is left on-screen too long.
CRT's, like other electronics, (besides being heavy) can be surprisingly durable, so it is within the realm of possibility that it could be old enough to be based on technology that would not prevent the "burn in" of an image.
Please err on the side of caution, if you err at all...