The first thing I would check is the bus cable connecting the two boxes. Then, I would verify that all the power supplies are working.
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If that doesn't help, I would re-seat the boards in the processor cage. It might help to find out if yours really is a 8568A. It may have been converted to a "B". The "A" has a separate memory board, while the "B" has memory on the processor board. If it is an "A", check also the NiCd battery pack which usually leaks and does some damage. The service manual has useful information regarding the two Check LEDs.
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Vladan
