Apple Mac mini manual Deep Dive, Check Result Action Code, M20

Deep Dive

Unlikely cause: speakers

Check		Result	Action	Code
1.	Connect AC to computer and	Yes	The system is powering up.
	press the power button on		Jump to Won’t Start Up
	system. Verify if there is any		symptom flow.
	indication that the system has
	powered up (fan rotation, hard	No	Go to step 2.
	drive or optical drive noise, ...).
2.	Reseat the installed SDRAM	Yes	Badly seated SDRAM memory
	memory module(s) and retest.		module. Reseating it resolved
	Does the computer start up		issue.
	properly now?
		No	Go to step 3
3.	Replace installed SDRAM	Yes	Replace defective user’s
	memory module(s) with		SDRAM memory module.
	known-good one. Does the
		No	Go to step 4
	computer start up properly
	now?
4.	Remove bottom cover,	Yes	Reseating the power button
	disconnect AirPort antenna		connector on logic board
	and remove shield, disconnect		resolved the issue.
	and remove fan and cowling,
		No	Go to step 5.
	then disconnect the following
	cables from logic board before
	being able to extract it :HDD,
	ODD/HDD, Ambient sensor,
	HD sensor, ODD/HD sensor, IR/
	LED cable. Check and reseat
	power button cable connection
	to logic board and verify if the
	unit powers on.
5.	Remove the coin battery on	Yes	Issue resolved by logic board	M20
	the logic board, and leave out		reset. Measure DC voltage
	for approximately 1 minute.		on the battery touching the
	Then reinstall the battery. This		battery with the red probe,
	will reset the logic board. Does		and grounding with the black
	the computer startup properly		probe. If voltage is 2.7v or less,
	now?		replace the battery. See KBase
			article http://support.apple.
			com/kb/HT3250 for details
			on using a digital multi-meter.
		No	Go to step 6.

2010-08-03 Mac mini (Mid 2010) Symptom Charts — Startup and Power  19