One other thing to keep in mind is that if your computer loses power (ie, a desktop that gets unplugged or a laptop that runs out of battery while asleep - because computer still use up a small amount of power while asleep), it will be completely fine if it was hibernating or powered off, but if your computer was asleep, you will lose any work that you didn't save. It takes a little longer to hibernate and resume from hibernation than it would for sleep, and it doesn't work 100% well on all computers (same deal with sleep), but it's generally pretty good. Your RAM is saved, so your computer can remember what you were doing, but it's saved to your hard drive, so your RAM doesn't have to stay powered. That's basically a compromise between a full shut down and sleep. This saves a copy of your RAM to your hard drive. If you're really worried or really energy conscious, you can use hibernate. I haven't ever heard of a computer being on sleep for a long time damaging the RAM, though it is theoretically possible. This needs to stay on because your computer basically forgets everything in its RAM when it's powered off. The main exception is your RAM (memory), which is necessary to allow your computer to resume quickly. That includes your processor, hard drive, network cards (usually), and just about anything else. When your computer is on standby or is in sleep mode, most of the computer is 100% off. LEDs can last up to hundreds of thousands of hours (according to ), so you shouldn't worry about it burning out. The light that you see on when your computer is on standby is an LED (light emitting diode). If you're interested in learning more, read on. Sleep will cause very minimal wear and tear.
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