However, I do have a cat, and while the computer isn't ON the floor, it sits maybe a foot off the floor. I only turn it off if there's a thunderstorm. He claims that it's less wear and tear on the moving parts than powering up and down with each use. The guy who built my computer is a full time IT guy and he recommends leaving the computer on 24/7. I sent him on his way after refusing to sell him a power supply. The dog hair and dust has surely accumulated inside the computer and it eventually caught fire. I started asking questions, and sure enough, he left it on all the time.
The most recent purchase caught fire and almost burned his trailer down, so he planned to sue the company. He went on a rant against CompUSA because they'd sold him his last two supplies that only lasted a year. OT story: When I owned a computer business, a guy came in one day to look at power supplies. Yes, I've seen mummified roaches in computers. Sometimes it is like looking into the inside of a mattress, there are all sorts of things in there. I've seen the insides of many computers and such where the owners leave the fans on full-time. I feel that it is particularly important to turn off devices that have cooling fans. I have everything plugged into a Furman conditioner and turn the devices off when I'm done (except the speakers, which are turned off individually and last-on, first-off). So at the end of the day, I guess it depends on how expensive the gear is: some cheapo ART TubePre preamp? Turn it off. There's also the power savings too factor that in. Still, if mitigating the very slim risk of catastrophic failure is worth having to replace your gear sooner (or at all), then by all means, shut it off. Power cycling _is_ hard on electronics (PSUs in particular): it's the cold-hot-cold-hot cycle that causes premature failure, at least on computer components, but I would think that this is applicable to all electronics. Unless you're buying questionable ghetto Chinese knock-off gear or have some ancient pre-red tape stuff, there's a pile of safety regulations that any electronic device has to pass nowadays (CSA here in Canada, think it's Consumer Product Safety Commission in the States) so stuff bursting into flames is a very very low probability.
If my board didn't consume a fair amount of power I'd never shut it off either. The rest of my gear depends on what I have going on.
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