Hi guys... I just bought new PC with ASUS P4P800-E Deluxe MOBO and cannot get MOBO's LAN (Marvell Yukon Gigabit chip) working properly with my Terayon 720x (DOCSIS) cable modem that has 10/100BaseT port. The cable used is standard patch CAT-5e cable supplied with cable modem. Of course, PC and modem work fine with <20$ PCI NIC (this is what I'm using as I write this post ). I have Windows XP Pro SP2 installed with all the latest drivers ASUS provided on web-site. Gigabit device is visible, can be enabled/disabled, parameters can be set for the driver through device properties etc. Everything seems to be normal except that it will not go into "Connected" status. After enabling it goes into "Network cable unplugged" state and stays there forewer. In XP Event viewer there are following messages: ... =============================== Event Type: Information Event Source: yukonwxp Event Category: None Event ID: 83 Date: 11/24/2004 Time: 10:11:33 PM User: N/A Computer: NONE Description: Port A is down Data: 0000: 00 00 00 00 02 00 5a 00 ......Z. 0008: 00 00 00 00 53 00 07 60 ....S..` 0010: 00 00 00 00 00 00 00 00 ........ 0018: 00 00 00 00 00 00 00 00 ........ 0020: 00 00 00 00 00 00 00 00 ........ =============================== Event Type: Warning Event Source: Dhcp Event Category: None Event ID: 1007 Date: 11/24/2004 Time: 10:12:24 PM User: N/A Computer: NONE Description: Your computer has automatically configured the IP address for the Network Card with network address xxxxxxxxxxxx. The IP address being used is 169.254.218.137. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 00 00 00 00 .... =============================== Initially, the cable modems link LED were off although I expected that devices will auto-negotiate the speed. I had to configure device driver not to use Autosense - any other setting (10/100 Mbs half/full duplex) and link LED on cable modem goes on. However, LEDs on MOBO connector are off permanently. I used Yukon's Virtual Cable Tester diagnostic SW: - with disconnected modem it says all 4 pairs are open at 2m distance which is OK - with modem connected, it says pairs 1-2 and 7-8 are 'normal cable' and 3-6 and 4-5 are 'open cable' at 2m To me it really looks like a cable problem, but the cable used is standard CAT-5e patch cable which works fine with 10/100Base-T. As far as I know it should work for 1000-BaseT as well - especially when gigabit device is forced to behave as 100-BaseT. However, what VCT reports makes no sense to me as it reports pairs 1-2 and 7-8 as connected correctly (I'd expect 1-2 and 3-6). Is it possible that ASUS screwed up the pinout on the MOBO RJ-45 connector or I need a different cable or am I missing something here? I'm not sure whether it's the proper thread to post this, but I'd really appreciate some ideas as I'm completely stuck. Thanks in advance.