No Video

Unlikely cause: hard drive, optical drive, speakers, camera, microphone

Quick Check

Symptoms

Quick Check

 

 

 

No Video

1.

Check brightness setting.

No image.

2.

For no-video issues, connect an external display

Backlight failure.

 

to Verify if iMac video circuitry is functioning.

 

 

 

If image appears on external display go to

 

 

 

Backlight Issue/No Backlight symptom flow.

 

 

3.

Reset SMC.

 

 

 

 

Deep Dive

Check

Result

Action

Code

 

 

 

 

 

1.

Verify boot chime present and

Yes

Power ON self test OK. Boot

 

 

fans running when system

 

sequence started.

 

 

powered ON. (Reset SMC, clear

 

Go to step 2.

 

 

PRAM or reseat Backup Battery

 

 

 

 

No

Go to Won’t Start Up

 

 

if necessary for proper boot

 

 

 

symptom flow.

 

 

up.)

 

 

 

 

 

 

 

 

 

 

 

2.

Verify if image is visible on

Yes

Video present. Verify system

 

 

built-in LCD panel.

 

functionality and return to

 

 

 

 

user or jump to appropriate

 

 

 

 

troubleshooting flow.

 

 

 

 

 

 

 

 

No

Go to step 3.

 

 

 

 

 

 

3.

Connect supported external

Yes

External display detected by

 

 

display. Verify if image appears

 

system. Video circuitry on

 

 

on external display when

 

logic board functional.

 

 

system is booted.

 

Inspect DisplayPort cable to

 

 

 

 

 

 

 

 

back of panel connection.

 

 

 

 

Reseat and test again. If you

 

 

 

 

continue to have problems

 

 

 

 

go to Backlight Issue/No

 

 

 

 

Backlight symptom flow.

 

 

 

 

 

 

 

 

No

Go to step 4.

 

 

 

 

 

 

2010-09-09

iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power  46

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Image 46
Apple MD094LL/A manual Symptoms Quick Check No Video, Go to Won’t Start Up, Go to Backlight Issue/No