Just as a thought on this, I'm not in electronics that much but I've read a
few times that turning electronic equipment off is sometimes more stressful
when you turn them back on because the current that is suddenly applied to
the circuits. Don't ask me to explain or elaborate, it's just what I've read
and heard a few times...
This has been posted very recently posted on the iMac LEM list:
It has basis in the days of vacuum tubes. It has to do with the Tungsten filaments used in the CRT type monitors. Tungsten has a positive temperature coefficient of resistance; the cold resistance being about a third of that at the operating temperature. So when you turn on a CRT from cold, three times the current flows through the filament until it heats up. The theory is: Multiple turn-ons stress the filament and it can fail earlier than when it is allowed to run hot (or reasonably warm) when not in use. (You may have noticed how incandescent lamps sometimes burn-out at the time they are switched on) There are ways to limit the initial inrush current to avoid this kind of damage. With proper attention to design, this should not be an issue with modern CRT based equipment. Nor should it have anything to do with the LCD type monitors.
If anyone's interested more in this, look in the iMac list archive (topic called "Sleep," beginning of September) -- I assume that it's publicly available?
Marcin Wichary
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