Chapter 6. IBM System x3850 X5 and x3950 X5 227
The DIMM configuration is invalid. See the DIMM placement tables in “x3690 X5 memory
population order” on page 133 for details.
A nonfunctional DIMM, failed DIMM slot, bent processor pin, or resource conflict with a
PCIe adapter. Swap the DIMM with a functional DIMM, reactivate the DIMM by pressing
F1-Setup, and retest:
– When the problem follows the DIMM, replace the DIMM.
– When the problem stays with the memory slot location, remove any non-IBM PCIe
adapters, reactivate, and retest.
– When the failure is in the same slot on the memory board, verify that the memory
board is completely seated or swap memory boards with a known functional memory
board location, reactivate, and retest.
– When the problem remains with the memory board location, a bent processor pin might
be the cause.
– Contact IBM support for replacement parts.
The firmware of the server contains a a powerful diagnostic tool. Use the following steps to
perform a simple test of a new memory configuration before placing the server into
production:
1. During POST, at the IBM System x splash panel, press F2-Diagnostics, as shown in
Figure 6-3.
Figure 6-3 How to access diagnostics in POST
2. When the built-in diagnostics start, they start the Quick Memory Test for all of the memory
in the server, as shown in Figure 6-4 on page 228. You can stop the Quick Memory Test at
any time and run a Full Memory Test, which runs the same test patterns multiple times and
takes five times longer than the Quick Memory Test. The only time that you want to run the
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