During the first phase of the SBS setup, there is a point right around 34 minutes where the USB ports are knocked out.
That is also right around the time that the Intel SRCSASRB RAID card drivers will have a WHQL warning pop-up message that one will need to acknowledge.
If there is only a USB keyboard and mouse installed on the server, one will not be able to click on the Continue button. One will need to reset the server and plug in a PS/2 keyboard or mouse to get to the pop-up window.
Once the pop-up driver windows have been acknowledged, the setup can proceed without the need for any further input via a PS/2 keyboard.
This situation is one reason to keep a PS/2 keyboard around besides the need for one on KVMs.
Microsoft Small Business Specialists
*All Mac on SBS posts are posted on our in-house iMac via the Safari Web browser.