I'm wondering what would cause a person's network logon to fail consistently after a reboot but succeed after a cold boot. This person's computer locks up frequently, and it apparently is due to a hardware problem. The computer will be replaced, so my question is not about the lockup. However, when the computer locks up the user reboots and has trouble logging on to the network. After shutting the computer completely down and powering back on, she can log on. Windows 2003 network, single domain, Active Directory-integrated DNS. Windows XP OS on the desktop.