Apple MD094LL/A manual Symptoms Quick Check Incorrect/Missing Colors

Incorrect/Missing Colors

Unlikely cause: power supply, hard drive, optical drive, fans, speakers, camera, microphone

Quick Check

Symptoms		Quick Check
Incorrect/Missing Colors		1.	Allow display to reach normal operating
•	Wrong color display		temperature for about a minute before
•	Color/contrast issues		evaluating front-of-screen performance.
		2.	Verify if System Preferences > Display settings are
			configured to use default display profile.
		3.	Verify System Preferences > Universal Access >
			Display “Enhance contrast”, “Use grayscale”, and
			“Black on White/White on Black” settings are set
			to defaults.

Deep Dive

Check		Result	Action	Code
1.	Verify computer has been	Yes	Go to step 2.
	warmed up for about a minute
		No	Warm up computer for about
	to stabilize backlight before
			a minute. Go to step 2.
	continuing.
2.	Verify if all four cables on back	Yes	Go to step 3.
	of LCD panel are secure at both
		No	Reseat connections, replace	L14
	ends.
			damaged cable(s) if needed.
			Retest.
3.	Go to System Preferences >	Yes	Suspect poor video	L14
	Desktop & Screen Saver >		connection. Replace internal
	Desktop and set color to Solid		DisplayPort cable between
	Gray Light. Verify if incorrect/		logic board and LCD panel.
	missing color issue affects
		No	Go to step 4.
	entire display.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Display  60