iMac (27-inch, Mid 2010) Symptom Charts — Startup and Power 46
2010-09-09
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, clear
PRAM or reseat Backup Battery
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 DisplayPort cable to
back of panel connection.
Reseat and test again. If you
continue to have problems
go to Backlight Issue/No
Backlight symptom ow.
No Go to step 4.