Thanks to adamsalac for his essential post and attachment.
I only add lines for Marvell Yukon 2 88E8042 into AppleYukon2.kext, with my ID device, and i replace it.
It works perfectly and it solve the problem of cable disconnected.
iPC 10.5.6
HP 6735s Notebook
AMD Turion X2 RM-70
ATI HD 3200
Marvell Yukon 2 88E8042 Ethernet
Broadcom 4322 Wireless b/g
AppleYukon2.kext.zip