Power Management FAQ

Sleep or Standby are synonymous. This is a power state whereby the computer shuts down as much as possible but keeps applications that are currently running in memory, allowing you to quickly resume working where you left off once the computer is turned on.  However if your computer is fully powered off or the battery becomes completely drained on a laptop anything stored in memory is lost and will not be restored upon powering-on your computer.

Hibernate is similar to standby/sleep mode with the exception that all memory is first written to a file on your hard drive and then the computer is powered off.   Once your computer is powered on the hibernation file is loaded into memory and you are able to resume working where you last left off.