ethernet does not work

My Sony PCG-GRX700P's integrated 100MB network adapter can not access internet after it is connected to the cable router. The device manager showes it is working properly with no conflict. When I click "repair this connection", the report is "test failed, can not renew IP address" although I set it to obtain IP automatically.It is the same after I uninstall and install the driver for it. When I firmly connect the ethernet port directly to a cable modem with a ethernet cable, the Windows XP Professional's window of internet connection showes that the network cable is unplugged very frequently. Any advice or help is appreciated.

所有跟帖： 

• 好像Cable Modem坏了。你的Cable Modem用多久了？ -加州老李- ♀ (27 bytes) () 03/26/2006 postreply 14:49:38

• 换根Ethernet线试试。 -自由下载- ♂ (0 bytes) () 03/26/2006 postreply 14:55:02