The operating system can also understand multiple types of ACPI signals, which is how some laptops are able to have separate power and sleep buttons. When you press the power button on your computer's case, it doesn't suddenly cut power - it sends a signal to the operating system and tells it to shut down. These questions were answered by the Advanced Configuration and Power Interface (ACPI) standard, which new computers have used for more than a decade.
#BARNEY ERROR HAS A BUTTON BEFORE YOU TURN OFF YOUR COMPUTER WINDOWS#
If you did this on Windows 95, your computer would have to run ScanDisk when you booted it back up, attempting to repair all the damage caused by the shut down.
You may lose work and the file system might be corrupted. A sudden power cut means the computer won't be able to shut down cleanly. Just as you wouldn't yank a desktop computer's power cord out of the outlet while it was running today, you wouldn't press the power button to shut off then. When you pressed it, it immediately cut power to the computer's hardware. The power button wasn't very smart in those days. When it was ready for you to shut down, you'd see the message "It's now safe to turn off your computer" on your screen and you'd press the power button to shut it off. You opened the Start menu, clicked Shut Down, and waited patiently for the computer to finish up whatever it was doing. If you ever used Windows 95 on an old computer, you'll probably remember how you had to turn off the PC. But there is a power button - and it's on your PC's case.
This is especially useful on Windows 8, where there's no obvious power button unless you know to look in the charms bar or the hidden Windows Key + X menu.
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