IBM Flex System p24L Installation And Service Manual page 470

Results
If the problem is solved when you remove an I/O expansion card from the compute node but the
problem recurs when you reinstall the same expansion card, suspect the expansion card; if the problem
recurs when you replace the expansion card with a different one, suspect the system-board and chassis
assembly.
If you suspect a networking problem and the compute node passes all the system tests, suspect a
network cabling problem that is external to the system.
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Power Systems: IBM Flex System p24L Compute Node Installation and Service Guide