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I'm guessing you were doing this via the HMC? If it was shared, try starting another session as a work around.
I mention this because i've heard an occurance like this was a known issue with IBM. may have been a PTF.
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C6004504 is "Verifying system serial number"
Is this a new machine?
If not what has changed since your last IPL?
Last Answered:
Oct 7 2009 10:44 PM GMT by Whatis23 
4040 pts.