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We had a similar issue with one of our C4's it turned out to be the v440 it was attached to.
I pulled both power leads on the v440 to reset the systemboard and scsi hba and all was good, I could then see the C4 after a probe-scsi-all.
As a precausion Sun also changed both terminators for single ended terminators, this reduces the i/o to 40mb/sec both reduces the amount of interference from the HBA.
Don't forget to boot everything in the right order. Leave the server off completely and first boot up the C4 this takes up to 10 minutes.
Then power on the server to the ok prompt do a probe-scsi-all and the robot should show as a qantum px500.
If not even after you've pulled both power leads on the server then look at cables, termination or scsi hba.
What server are you using for the media server connected to the C4 and what scsi hba are you using.