IBM HC10 - BladeCenter - 7996 Service Manual page 92

v Check if the problem is being experienced with more than one blade workstation.
Perform a test of the function on a known-good blade workstation.
v Try the blade workstation in a different blade bay.
v Try a known-good blade workstation in the blade bay.
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BladeCenter HC10 Type 7996: Problem Determination and Service Guide