jepsen1977: from a technical viewpoint what is best for the PC in terms of wear and tear of the parts inside the PC, to leave it running or turn it off?
Some people suggest sleep mode or maybe hibernate, but wouldn't they have pretty much the same effect (if any) to the "wear and tear" as properly shutting the machine down?
I've heard these rumors that e.g. keeping the HDDs running all the time is better than constantly switching them on and off (cooling down and heating up over and over again), but meh. No idea if it is obsolete information, or even an urban legend. I've heard similar claims also for capacitors (on the motherboard) and such, ie. they last longer if the system is running all the time. I'm not sure.
If I know I will return to the PC in one hour or so, I probably leave it running just so that I don't have to wait it to power up. Otherwise I shut it down, unless I am downloading something in the background etc.
I've actually switched off completely any sleep or hibernate functions. I recall sometimes having some issues with them, ie. hard drive stop spinning even though I was downloading something, or the PC going to sleep even though there was something ongoing in the background. Or maybe I was afraid some files on external USB devices might get corrupted if the sleep or hibernate mode kicked in while the files were still open.
Are the sleep and hibernate mode timers nowadays smart enough not to put it to sleep in case there is any kind of data transfer or something ongoing?