Windows XP – Why Do Old Computers Ask to Manually Turn Off Power?

windows xp

I saw a very old computer running Windows XP. On the screen it shows a windows flag and the following text:

Windows has been shut down. You can safely turn off power.

What does it mean? Why is the computer requiring to turn off power?

Best Answer

Not always did computers have the necessary hardware to power down on their own. More important still, even after they had acquired this feature (mostly through the legacy ACPI mechanism), there was a long period of time, when BIOS implementations were so wildly uncompatible, that the OS was very often unable to successfully access these facilities.

Up until NT4 the "Windows has been shut down. You can safely turn off power" screen was standard, with NT5 (a.k.a. Windows 2000) the switch to ACPI poweroff became widespread, and with NT 5.1 (a.k.a. Windows XP) it became the new normal. There was still a lot of hardware, that could not be shut down by XP, so the text remained seen quite often.

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