IMac network won't connect 1000mb/1GB - only 100mb works

I have an intel iMac.
It used to connect to my 1GB switch at 1GB, but recently it will only connect at 100MB. I have swapped leads, tried with another switch, but it will still only work over ethernet at 100MB connection.
When i manually select 1000mb in System Pref>Network, it wont connect at all to the switch.
So, i have to revert to the 100mb connection to get on my network.
Any ideas?

I did, but honestly, I cannot remember at the moment!
Sorry

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IMac network won't connect 1000mb/1GB - only 100mb works

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