Apple MD094LL/A Manuale Utente

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

 2010-09-09

AirPort/Bluetooth Issues
•  Unable to join networks or pair 

devices

•  AirPort card not available
•  Intermittent device or 

connection dropouts

•  Limited wireless range

1.  Verify that AirPort or Bluetooth is turned ON, and 

for AirPort issues make sure that a network is 

selected.

2.  (AirPort) Run the Apple System Profiler and verify 

that installed AirPort card supports the channel 

number used by the wireless access point.

3.  (AirPort) Check if the wireless access point 

requires special connection and encryption 

protocols.

4.  (AirPort) Check for nearby sources of interference 

such as microwave ovens or cordless phones. See 

5.  (AirPort) Check the number of users trying to 

use AirPort in the area for possible network 

congestion (available bandwidth).

6.  (Bluetooth) If customer complaints about a 

Bluetooth issue with his input device, first use a 

known-good Bluetooth input device to perform 

tests with computer. Then test customer’s 

Bluetooth device on known-good computer to 

define which side is creating the communication 

issue. See 

source of interference. 

7.  Isolate potential OS issues by starting up 

from original Install media for the computer, a 

same-model computer in Target Disk Mode, or 

compatible known-good OS on an external drive. 

Both AirPort and Bluetooth services are available 

when booted from Install disc.