We have 9 new Windows 7 systems and have installed Fiber cards in them. We have used Startech 1000Base-SX cards and Transtion Networks N-GSX-SC-01 cards. We get the same message when trying to logon to a system when the workstation has either been powerd off or has sat for a day with not being logged on. If you pull the fiber line out and put it back into the card or reboot you will be able to login. sometimes it take doing those 2 or 3 times. All computers have IP numbers assigned to them. Is this something that someone here has a fix for? The BIOS is upto date and the drivers are the newest. The same cards work in our XP systems without issues. Thanks for the help. Greg

Under the network adapter properties - power management Uncheck "Allow computer to turn off this device to save power" Windows is probably turning off device to perserve the power.