Missing Win2k Server

I have a small Microsoft Windows 2000 domain setup with a MS Win2k Server(SP3) and about 20 MS Win2k Professional workstations. We haven’t had any problems with our network and then all of a sudden the server is not in the network place or can not be found by using the net commands. But here is the weird part all of the network drives that are mapped from the server still work. Also when I’m on the server I can see the entire network and the server is listed in the group, But from the workstation point the server is not listed in the group. The printers that were mapped from the server don’t work. So I had to set them up on the machines locally. But does anyone have a solution to why my server drop off the radar. Help!!!