Or please refer following steps to re-write MAC address under Windows® Vista™.
Step1: Check MAC address.
When system boot up, press "F2" to enter BIOS setting.
Boot-> "Boot settings Configuration" -> set "Boot From Onboard LAN" to "enable".
Press "F10". System will restart.
Please "F11" and select "NVIDIA Boot Agent".
Then you will see MAC address, pls. record it with no space for later usage.
Step2: Boot system into Window Vista
Right click "Computer" and click "Properties"
Click "Device Manager"
Right click "Networking Controller" and click "Properties".
Choose "Network Address" in "Advanced " folder.
Write "MAC Address" which got from step1 into Value item.
Then click "OK".
My motherboards are K7VT4A+ and K7VM3. During the POST, it shows "Mac address are invalid in both CMOS and DMI. Press F1 to resume". What should I do?(12/15/2004)
Answer:Please try to install your CD-ROM, CD-RW, DVD-ROM, or DVD-RW to primary IDE (IDE1, blue connector) and install your hard drive to secondary IDE channel. If you still encounter problem, please download the tool to rewrite the MAC address from: https://www.asrock.com/support/Download/MACTool.asp
My on-board LAN is not working, I found that the MAC address of my on-board LAN is 00-00-00-00-00-00 or FF-FF-FF-FF-FF-FF. What's wrong?(4/15/2004)
Answer:The MAC address of the on-board LAN is erased. After updating the BIOS or clearing the CMOS, please boot up the system and enter the BIOS setup. After loading the BIOS default, please exit and save changes. Failing to do so may cause the MAC address disappeared. If the MAC address is gone, please contact ASRock technical support engineer for help. ( https://www.asrock.com/general/about.asp?cat=Contact )