Apple MD094LL/A Hard drive, update OS with, Cord and AC outlet, Verify if, Supply replacement

Deep Dive

Check		Result	Action	Code
1.	Activity related shutdowns:	Yes	Check with known-good
	Reset SMC and PRAM and		bootable drive: go to step 2
	verify that shutdown issue still
		No	Shutdown cause was related
	happens.
			to SMC or PRAM programmed
			shutdown settings or
			corruption, and was resolved
			by reverting them to default
			settings.
2.	Booting from known-good	Yes	Go to Power related
	bootable drive , verify that		shutdowns on step 3
	shutdown issue still happens.
		No	Shutdown events do not
			happen on known-good OS.
			Reinstall Mac OS on customer
			hard drive, update OS with
			latest version and check if any
			firmware update is available.
3.	Power related shutdowns:	Yes	Go to step 4.
	With known-good AC power
		No	AC power cord / outlet issue.	X03
	cord and AC outlet, Verify if
	system continues to restart or		Issue resolved.
	shutdown
4.	Disconnect hard drive power	Yes	Go to step 5
	cable from hard drive and
	startup the computer from
	other bootable media (like
	Install DVD, a same model
		No	Possible bad software or hard
	computer in Target Disk Mode,
	or a compatible known-good		drive. Go to Hard Drive Not
	OS on an external drive). Verify		Recognized symptom flow.
	if system continues to restart or
	shutdown.
5.	Inspect and reseat AC inlet	Yes	Replace damaged cable.	X03
	connection to power supply		Retest. Return to step 1 if
	(the smaller of the 2 cables		problem continues.
	connected to power supply),
	and DC power cable from	No	Go to step 6.
	power supply to logic board.
	Verify if damage is observed on
	the cables or connectors.
6.	Install known-good power	Yes	Reinstall original power
	supply. Verify if system		supply. Go to step 7.
	continues to restart or
		No	Issue resolved with power	P02
	shutdown.
			supply replacement.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power  42