Very Bizarre. We have just done an upgrade to our ERP system. All systems that upgraded (about 60 client PC's) were upgraded fine with the exception of 1 laptop. The laptop in question could ping our old servers, UNIX (where old ERP system was) and Windows included, but cannot ping the new server. I've reformatted the laptop two times. First it was formatted with W2000 Pro, chipset and drivers installed, and still couldn't ping our new UNIX server, but it could still ping all others. I decided then to format with XP Pro, loaded the chipset and NIC driver only in order to connect to the network. Same thing happened where it could ping everything except 192.168.1.21. I was able to ping the laptop from the server in question, but the laptop could not reach the server. I have tried ipconfig /release and /renew, netstat -a (although I'm not entirely sure what to look for), critical updates for windows etc. When attempting to do a tracert on a working PC there is only 1 hop and it completes; on the laptop in question it times out every time. Is there something in the BIOS that may have been changed or altered.