242 Powering down the computer
runs a self-test, loads the operating system, and then returns to the
mode in which you left it.
NOTE: If you use a USB mouse or keyboard, remember to
save your data and close any open applications before
selecting Standby or Hibernation modes.
Factors to consider when choosing Hibernation:
While in Hibernation mode, the computer uses no battery
power.
Because the state of the system is held on the hard disk, no
data is lost if the battery discharges while the computer is in
Hibernation mode.
When starting up again, this choice uses less time and battery
power than the Shut down option. But it uses a little more time
and battery power to start up than the Standby option, because
information is being retrieved from the hard disk instead of
from memory.
On restarting, the computer returns to the mode in which you
left it, and opens all the programs and files you were using.

Standby command

The Standby command puts the computer into a power-saving
mode. Standby stores the current state of the computer in memory
so that, when you restart the computer, you can continue working
from where you left off.
NOTE: If you use a USB mouse or keyboard, remember to
save your data and close any open applications before
selecting Standby or Hibernation modes.
Factors to consider when choosing Standby: