Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 40)

Mac mini (Late 2009) Symptom Charts — Communications 40 2009-11-03
Connect the computer to 3.
another Macintosh computer
using CAT5 ethernet cable.
Mac OS X 10.5 users see article
< http://docs.info.apple.com/
article.html?path=Mac/10.5/
en/8429.html >.
Mac OS X 10.6 users see article
< http://docs.info.apple.com/
article.html?path=Mac/10.6/
en/8429.html >.
Can you connect successfully?
Yes Ethernet communication
good. Go to step 4
No If same ethernet cable and
computer connects to a
known good computer of
same make and model,
replace logic board
M10
Check for speed and duplex 4.
issues on the network. Open
System Preference > Network;
click the Advanced button,
then the Ethernet tab. Is the
speed and duplex reported
what is expected?
Yes Go to step 5
No Change the speed and duplex
settings. See article < http://
docs.info.apple.com/article.
html?path=Mac/10.5/
en/8711.html >. Go to step 6
Check for MTU (Maximum 5.
Transmission Unit) issues.
See article < http://support.
apple.com/kb/HT2532 >. Does
changing the MTU settings on
the computer resolve the issue?
Yes Go to step 6
No Ethernet controller damaged.
Replace logic board.
M10
If changing the speed, 6.
duplex or MTU settings
allows connectivity, check
with another computer of
same make and model. Does
the known good computer
produce the same results?
Yes Check with ISP or Network
Administrator concerning
speed, duplex and MTU
settings.
No Verify with known good OS. If
the issue persists, replace the
logic board.
M10