iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 37
2010-11-18
No Video
Unlikely cause: hard drive, optical drive, speakers, camera, microphone
Quick Check
Symptoms Quick Check
No Video
• No image.
• Backlight failure.
1. Check brightness setting.
2. For no-video issues, connect an external display
to Verify if iMac video circuitry is functioning.
If image appears on external display go to
Backlight Issue/No Backlight symptom ow.
3. Reset SMC.
Deep Dive
Check Result Action Code
1. Verify boot chime present and
fans running when system
powered ON. (Reset SMC and
clear PRAM if necessary for
proper boot up.)
Yes Power ON self test OK. Boot
sequence started.
Go to step 2.
No Go to Won’t Start Up
symptom ow.
2. Verify if image is visible on
built-in LCD panel.
Yes Video present. Verify system
functionality and return to
user or jump to appropriate
troubleshooting ow.
No Go to step 3.
3. Connect supported external
display. Verify if image appears
on external display when
system is booted.
Yes External display detected by
system. Video circuitry on
logic board functional.
Inspect LVDS cable
connection to back of LCD
panel. Reseat and test
again. If issue persists, go to
Backlight Issue/No Backlight
symptom ow.
No Go to step 4.
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