This was covered on .com last week you may want to search there.
The manufacturers contend that this is no longer a problem. The big concern is environmental. Leaving the tower on 25/7 is like leaving a 40w lightbulb on 24/7
If you have a CRT screen and that does not go into powersave (not screensave) then that is the same as leaving a 100w bulb on 24/7.
Just adds to you leccy bill and the environmental considerations that go to making that leccy.
I leave my PC on 24/7 but the screen goes into power save after 15mins of inactivity.
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