Boot the machine whilst holding the STOP & N key on your keyboard,that will
reset your obp to defaults, then hook up a null modem cable to the sun &
another box, run a terminal emulator on the other box, power cycle the sun &
hold STOP & D
this will cause the sun to do a full hardware diag.
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http://clk.atdmt.com/UKM/go/msnnkmgl0010000002ukm/direct/01/