When I got my 1st Mac (about 10 years ago) I was advised by some IBM geek, that I should NEVER switch my computer off! If I recall he said something along the lines of - "Never switch it off, unless you have too, as the amount of power/strain that it has to go through to turn back on, and read the whole structure again is usually the reason that causes it to crash/burn out" etc, etc... I'm sure we've heard it all before, right? But, surely these days, Computers/Macs are powerful enough to be turned on and off, without imploding? For sure, I just put mine to sleep over night, maybe even if I'm away for a weekend, but I'll definitely switch it off if I go on vacation... But is this practice still relevant today? Will I get more life out of it, if I just keep doing what I've been doing, or can I switch it off every night when I go to bed? Is there a tried and tested real life test/rule?