iMac (21.5-inch, Late 2009) Symptom Charts — Communications 74
2010-11-18
4. Check for speed and duplex
issues on network. Open
System Preference > Network;
click the Advanced button,
then the Ethernet tab. Verify if
the speed and duplex reported
are what is expected.
Yes Go to step 5.
No
Change speed and duplex
settings. See article http://
docs.info.apple.com/article.
html?path=Mac/10.5/
en/8711.html. Go to step 6.
5. Check for MTU (Maximum
Transmission Unit) issues. See
kBase #HT2532: Mac OS X
10.4 or later: How to change
the MTU for troubleshooting
purposes. Verify if changing
MTU settings on computer
resolves issue.
Yes Go to step 6.
No Ethernet controller damaged.
Replace logic board.
M10
6. If changing speed, duplex
or MTU settings allows
connectivity, check with a
known-good, same-model
computer. Verify if known-good
computer produces the same
results.
Yes Check with ISP or Network
Administrator concerning
speed, duplex & MTU settings.
No Verify with known good OS.
If issue persists, replace logic
board.
M10
Wireless Input Device Doesn’t Pair
Quick Check
Symptoms Quick Check
Wireless Input Device Doesn’t
Pair
• Can’t get system to recognize
Bluetooth keyboard or mouse
1. Remove and reinstall batteries for device.
2. Check that device is powering on.
3. Use known-good batteries with device.
4. Ensure that device is being used within 30-foot
range for Bluetooth devices.
5. Ensure that the latest Software Updates have
been applied.
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