Thanks for replying, Theflash1932. You led me to the solution. I was trying to load Windows Server 2008 R2 evaluation version from a DVD written on my home PC. The 2850's optical drive is a TEAC CD drive, not DVD! Trying an ancient Windows Sever 2000 CD worked (not that I want to run such an old system). So I'll have to try and replace the slim-line CD drive with a DVD drive if I can source one that's not SATA.
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