ACPI

Short for Advanced Configuration and Power Interface, a power management specification developed by Intel, Microsoft, and Toshiba. This power management interface takes the power management out of the BIOS and gives control to the operating system (OS). Typically, a system's BIOS is only able to turn a device off after a certain period of inactivity. With ACPI, the user can instruct the OS to slow down the processor or enter sleep mode, such as a CD-ROM players, when they're not in use. ACPI defines a new interface to the system board, and enables the OnNow design initiative for instantly available PCs.

Using Test My Hardware to test ACPI 
Test My Hardware collects and displays system configuration information for your computers. This includes information about system configurations, computer components, and operating system. When support technicians troubleshoot your system configuration, they require specific information about your computer. You can use Test My Hardware information to quickly find the information that these technicians need to resolve a system problem.

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