whenever you turn any electronic component on or off it stresses the component, because of the way electrons move through a circuit it causes stress and heat, not good for any electronic part. It's called thermal shock - liken it to putting an egg from the fridge straight into boiling water - it cracks.
Turning your electronic circuit can do the same, think about it... light bulbs always blow when you turn them on, never 2 or 3 hours in to them being on eh.
Now circuits these days are built and designed to a higher quality standard, engineers factor these points in and rate the performance.
Point I'm making here is the "life" of any component is designed in "life hours", engineers know when that part will probably fail by using statistics and its not going to be within the first couple of years of life, why do you thing they can give warranties of 3 years etc on some parts like a PSU maybe, because they know the statistical life of the part.
They send parts to test houses and estimate how many times you'll turn it on or off over 3 years, i.e. 356 X 4 times a day for 5 years and replicate that use in tests.
Point: Turn it off it aint gonna blow, they (you'll) know you'll probably upgrade or throw something away before it goes wrong because the stats say so, save the environment and save some cash. Swich it off!
Zoidy
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