I've been running this mobo since the first RC came out. No issues with card or anything. I've been running a valid Windows 7 64 Bit Ultimate RTM installation for almost 2 weeks now, no issues. It first happened this morning when I opened up my PC from sleep mode and noticed i had no network connections, I went to work, came home, fiddled around with my modem and router and got it back online. I left for dinner, again came back to sleep mode and once again, had no network connection via a wired connection. However, this time, my LAN card was missing from the device manager after a reboot, I'm forced back onto wireless for the time being, but would love to get back on a wired connection, however, after many attempts, a few tries at adding it manually, i cannot get connection via my on board card. OS Name Microsoft Windows 7 Ultimate Version 6.1.7600 Build 7600 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Manufacturer System manufacturer System Model System Product Name System Type x64-based PC Processor Intel(R) Core(TM)2 Quad CPU @ 2.40GHz, 2394 Mhz, 4 Core(s), 4 Logical Processor(s) BIOS Version/Date American Megatrends Inc. 2001, 7/11/2008 SMBIOS Version 2.4 Windows Directory C:\Windows System Directory C:\Windows\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "6.1.7600.16385" User Name Mackey-PC\Mackey Time Zone Pacific Daylight Time Installed Physical Memory (RAM) 4.00 GB Total Physical Memory 2.94 GB Available Physical Memory 1.33 GB Total Virtual Memory 5.87 GB Available Virtual Memory 3.63 GB Page File Space 2.94 GB Page File C:\pagefile.sys Mobo is Asus P5B - the network adapter is RTL8111B PCI-E Gb LAN I'm pretty stumped, I have no idea what else to do. I updated my systems BIOS just last week.