Check/Verify FRU/Action
Check that the following are properly
installed:
• Power Cord
• On/Off Switch connector
• System Board Power Supply
connectors
• Microprocessor(s) connection
Reseat connectors
Check the power cord. Power Cord
Check the power-on switch. Power-on Switch
Additional Service Information
This chapter provides additional information that the service representative might
find helpful.
Power management
Power management reduces the power consumption of certain components of
the computer such as the system power supply, processor, hard disk drives, and
some monitors.
Advanced configuration and power interface (ACPI) BIOS
As this computer has an ACPI BIOS system, the operating system is allowed to
control the power management features of the computer and the settings for
Advanced Power Management (APM) BIOS mode is ignored. Not all operating
systems support ACPI BIOS mode.
Automatic Power-On features
The Automatic Power-On features within the Power Management menu allow you
to enable and disable features that turn on the computer automatically.
• Wake Up on Alarm: You can specify a date and time at which the computer will
be turned on automatically. This can be either a single event , a daily event or a
weekly event.
• Wake Up on LAN: This feature allows LAN adapter card to wake the System.
POST error codes
Each time you turn the computer on, it performs a series of tests to check that the
system is operating correctly and that certain options are set. This series of tests
is called the Power-On Self-Test, or POST. POST does the following:
24 Lenovo Legion Y720T Hardware Maintenance Manual
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