Lost Gigabit ethernet link on iMac Core 2 Duo

I have iMac Core 2 Duo and Linksys gigabit switch. I recently lost the ability to link at gigabit speed. I have switched and tested all cables with no problem there. I know the switch is fine because my Mac Mini still gets good gigabit link. When using automatic setting, I can get only 100baseT link. When try to manually configure to gigabit, I lose the link. I am suspecting either a hardware or driver problem has occured. Thanks in advance for any help you can give me.
iMac Intel Core 2 Duo 20 Inch Mac OS X (10.4.9)

CRASH REPORT:
Process:         Aperture [667]
Path:            /Applications/Aperture.app/Contents/MacOS/Aperture
Identifier:      com.apple.Aperture
Version:         3.2 (3.2)
Build Info:      Aperture-201088000000000~1
App Item ID:     408981426
App External ID: 4372644
Code Type:       X86-64 (Native)
Parent Process: launchd [130]
Date/Time:       2011-10-20 21:23:47.680 +0200
OS Version:      Mac OS X 10.7.2 (11C74)
Report Version: 9
Interval Since Last Report:          77957 sec
Crashes Since Last Report:           53
Per-App Interval Since Last Report: 206 sec
Per-App Crashes Since Last Report:   52
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Regions Near 0:
-->
    __TEXT                 0000000100000000-000000010078c000 [ 7728K] r-x/rwx SM=COW /Applications/Aperture.app/Contents/MacOS/Aperture
Application Specific Information:
objc[667]: garbage collection is OFF

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thank you for that.....this help me decide eother to purchase 2gb stick or not....well i heard from some website said that when apple post the specification at that time 2 gb stick still not b on the market just yet.....
http://en.wikipedia.org/wiki/Macbook
said that late 2006 macbook is able to put 4 GB too but only 3.25 readable.....while the other ram site that selling ram for mac product also state this point i'm not pretty sure about that......
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