gig switch not work but 100mb will

i have an imac computer and when i connect it to a gig switch, there is no connection. when i connect it to a 10/100 switch it works. can anyone tell me why?
this also happened when i tried to connect a 10/100 to a gig switch.
stevekee65Asked:
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Mark GalvinConnect With a Mentor Managing Director / Principal ConsultantCommented:
I would check the speed & duplex setting on the iMac. All gig switches should be set to auto/auto. It might be that the iMac has been hard set to 100/full or something which would mean conencting to to a gig switch would mean no auto neg.

What version of Mac OS is this on?

http://support.apple.com/kb/TA21213
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Mark GalvinManaging Director / Principal ConsultantCommented:
So, in summary:
iMac does not work on gig switch
iMac works on 10/100 swtich

When you state 'this also happened when i tried to connect a 10/100 to a gig switch' what test/s are you referring to?

What model (year) is the iMac?
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Mark GalvinManaging Director / Principal ConsultantCommented:
PS all macs since g4 come with gigbit as Apple was an early adopter.
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stevekee65Author Commented:
when i connect a linksys 24 port switch to the gig switch and it would act as if there were no connection. i believe it is one of the aluminum imacs.
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Mark GalvinManaging Director / Principal ConsultantCommented:
So really, anything you plug into the gig switch doesnt work?
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stevekee65Author Commented:
there are other computers connected to that gig switch. i connected the imac to all of the gig switches we have and nothing. i connect it to a 10/100 switch and it works
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Mark GalvinManaging Director / Principal ConsultantCommented:
Here is a link that would help for Mavericks
http://support.apple.com/kb/PH13958
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
Check your cabling.  Gig ethernet requires Cat5e or better cabling, patch panels, and connectors.  If any of these are older, you can have problems - I've seen issues where things don't connect, they do connect but fail to negotiate and just keep saying connecting.... (Windows), and go out intermittently.  First thing I'd do is verify your cabling.
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nader alkahtaniNetwork EngineerCommented:
Check cable if it compatible with GIG and the connectors
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corey tauriacNetwork Engineer / ConsultantCommented:
https://discussions.apple.com/thread/2170974?start=60&tstart=0

   Looks like this has been an issue for quite a while.  Most people were able to solve it by having the logic board changed out, but if this is an older model obviously that probably wouldn't so useful, but at least it works at 10/100.  For the most part and majority ruled on this one being most likely an issue with the logic board.
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