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== S1(POS) and S3(STR) ==S0 Full power (normal operating mode)S1 Hard drive and monitor shut down when not usedS2 Same as S1, but CPU is also shut off. Equiv to S3, so you may not see S2 mentioned anywhere.S3 Same as S2, and called Suspend to Ram (STR) or Sleep. RAM contents valid. CPU shut off. +5VSB powers the RAM.S4 Same as S3, only content of ram are written to disk. Called Hibernate. No power is needed in this state. On reboot, restores the ram from the image stored on disk.S5 All power off. Full reboot needed ? +5VSB still powers the same circuits powered by the CMOS battery, only the battery is not being drained as long as +5VSB is running. Flipping the switch to OFF on the back of the computer, causes the CMOS to use the coin cell for power, to keeptime/date. *s0: fully powered on. *s1: shuts everything off except for cpu, ram, hdd and the mobo, but keeps a low level of power to these devices to maintain sys info. *s2: ram is powered, cpu is powered but not running, sys info written to ram. *s3(suspend to ram-STR): shuts off everything except ram, writing all sys info to ram. *s4(hibernate): writes all sys info to hdd then shuts the computer down completely. *s5: complete shutdown, no info saved.