> So, in general, the graphics and ethernet cards are the only > "difficult" parts, right?
Ethernet cards usually work. Only some Broadcom, 3Com or Atheros (with a driver not merged with upstream kernels yet) Ethernet cards are listed as not working on h-node.org; some Intel or Realtek cards use optional nonfree firmware. Graphics is difficult; wifi cards are difficult too. > I was not sure about the DVD-Drive, USB ports, VGA and PS/2 connection. DVD drives use standard protocols, they work if the (usually) SATA controller on the motherboard works. (Some DVD drives have digital restrictions preventing using video discs of different regions.) I don't know any nonworking USB controllers; PS/2 has one standard interface for drivers so it will work.
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