Windows XP Tips
My Computer Won't Shut Down Itself After Installing XP
 

There are a number of users who are noticing that their PC will no longer automatically power down/shut off without pressing the power off button on the computers unlike in Windows Me/95/2000. There could be a number of reasons for this - but the main one seems to be that ACPI is not enabled on the computer or in Windows XP. Here is how to try that out:

1: Click - Start - Control Panel - Performance and Maintenance - Power Options
Tab

2: Then click APM - Enable Advanced Power Management Support

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