The power cord can be removed and the system is safe for disassembly (typically, only the real-time clock continues to run - using its own small battery).Ĭhanging the power management options in the operating system

G3, Mechanical Off: The computer's power has been totally removed via a mechanical switch (as on the rear of a PSU).

Other components may remain powered so the computer can 'wake' on input from the keyboard, clock, modem, LAN, or USB device.

G2 (S5), Soft Off: G2/S5 is almost the same as G3 Mechanical Off, except that the PSU still supplies power, at a minimum, to the power button to allow return to S0.

All content of main memory is saved to non-volatile memory such as a hard drive, and is powered down.

S3: Commonly referred to as Standby, Sleep, or Suspend to RAM (STR).

Power to the CPU(s) and RAM is maintained devices that do not indicate they must remain on may be powered down.

S1: All processor caches are flushed, and the CPU(s) stops executing instructions.

G1, Sleeping subdivides into the four states S1 through S4:.

'Awaymode' is a subset of S0, where monitor is off but background tasks are running. The ACPI specification defines the following four Global 'Gx' states and six Sleep 'Sx' states for an ACPI-compliant computer-system: The following is a portion of the Wikipedia article on ACPI. There are six (6) different 'sleep' states that your computer can use. Your computer uses a standard for power management called Advanced Configuration and Power Interface ( ACPI). Here's a couple of ways to fix a computer that goes to sleep/standby and won't wake up. The cause varies from computer to computer, but the fix is usually a change in the software and/or hardware settings. One problem that I see more often are systems that go into sleep/standby mode and cannot come out of it. Doing computer repair, I fix a wide range of problems.

Why wont my pc sleep