Apple MD094LL/A Manuale Utente

iMac (27-inch, Mid 2010) Symptom Charts — Mechanical 

 2010-09-09

2.  Verify if noise sounds like one 

or more fans running faster 

than expected.

Yes

Fans running fast. Reset SMC 

by disconnecting power cord 

for ~15 seconds then retest. If 

issue continues go to step 3.

No

Go to step 3.

3.  Verify if any tape, gasket, cable 

label, or cable is touching 

the fan blades and causing a 

ticking noise

Yes

Secure the material so it 

doesn’t touch fan blades. If 

tape adhesive has lost its 

stickiness, replace that section 

of tape

No

Go to step 4.

4.  Remove fans and rotate blades. 

Check for any dust that could 

be clogging the fans. Verify 

if fan blades spin smoothly 

without interference from fan 

housing and fan blades are all 

intact.

Yes

Go to step 5.

No

Replace affected fan(s).

5.  Run latest available Apple 

service utilities then ASD 

in  stand-alone tests looping 

mode, to verify if all sensor or 

fans related tests pass.

Yes

Noise issue resolved.

No

Check for correct sensors/fans 

connections on logic board. 

Check for pinched cables. 

Compare with known-good 

similar system, and check 

for unlisted sensors. Replace 

affected sensor/fan.

Stand/Hinge Issues
•  Bent stand
•  Broken hinge
•  Stripped screw/head
•  Stripped screw boss
•  Unable to install VESA mount (if 

supported on this model)

1.  Determine whether damage caused by user /

technician environment, accidental damage, or 

abuse.  If so, inform user/technician the failures 

are not covered by Apple warranties. Refer to 

2.  For hinge noise issues replace hinge mechanism.
3.  For information on selecting the adequate iMac 

VESA Mount Adapter and which computer 

models are supported, refer to installation 

manuals available at