IBM did a five year study on the Monitor < on all the time > question and concluded that they die earlier if left on all the time. IBM's conclusion and advice to their customers was to shut the monitors off once a day. This or course also results in energy savings which off sets the cost of monitor replacement. This may not be an issue to a single user but for a company using 300 monitors it is an important consideration. As far as turning your PC on and off....... as long as you don't routinely do it more then once in a 24 hour period I wouldn't worry about it either way. One of the best sites to learn about monitors is http://www.displaymate.com/. This company writes the software that all the computer magazines use to test and compare monitors. They also write video diagnostic software for professionals. There is a wealth of information on these pages with everything from what to look for when you buy a new monitor, how to care for it and how you should adjust it. For a free tool to adjust your monitor check out Nokia Test at http://nospin.com/rode/rode103.html m >I have found, however, that my monitors last longer if I never turn them >off. I have actually tested this out several times. I take two identical >monitors and instruct one user to keep it on all the time, regardless of >whether or not they shut down their computer, and the other user gets >instructed to shut theirs down every night no matter what. Invariably, the >monitor that gets shut down all the time goes out first. >Kyle PCBUILD maintains hundreds of useful files for download visit our download web page at: http://nospin.com/pc/files.html