>>Why haven't motherboards being integrated onto mini silicon wafers like CPU's have? Then you would just have connectivity out to the hard drive connector and other peripheral connectors.
>
>They have. http://en.wikipedia.org/wiki/Computer_on_a_chip
>
>They're more common in the embedded world. One widespread use in in cellphones.

Just think, a pc the size of deck of cards with a VGA connector, dc powerconnector and a whole whack of USB connectors.