Apple MD094LL/A manual M04

Deep Dive

Check		Result	Action	Code
1.	Boot from Install DVD and	Yes	Go to step 2.
	Verify if issue is still visible.
		No	Issue likely caused by
			software or driver issue.
			Troubleshoot for software
			issues. Make sure all software
			and firmware updates have
			been installed.
2.	Verify if issue is visible on an	Yes	Issue is NOT caused by
	external display.		internal LCD display.
			Go to step 3.
		No	Go to step 6.
3.	Remove video card, inspect	Yes	Replace video card.	M04
	connector for damage or		Go to step 4.
	corrosion. Reinstall video card
		No	Issue resolved by reseating
	and retest. Verify if issue still
	occurs.		video card.
4.	Verify if video corruption issue	Yes	Replace logic board. If a video	M04
	is still present.		card was replaced, reinstall
			the user’s original video card.
			Go to step 5.
		No	Issue resolved with
			replacement video card.
5.	Verify if video corruption issue	Yes	Return to step 1 and retest.
	is still present with replacement
		No	Issue resolved with
	logic board installed.
			replacement logic board.
6.	Inspect glass panel. Verify if	Yes	Clean glass and/or LCD using
	issue is caused by condensation		procedures in Glass Panel
	or contaminants on inside/		take-apart chapter.
	outside surface of glass panel,		Identify possible sources
	or on surface of LCD panel.
			of contamination (nearby
			cigarette/cooking smoke,
			heavy airborne dust, etc.)
			to prevent recurrence.
			Condensation should
			dissipate after computer has
			been running a few hours.
		No	Go to step 7.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power  49