System does not boot after replacing memory DIMM - Servers
Source
Retain tip H17510
Symptom
The system does not boot after replacing the memory DIMM.
Affected configurations
The system is any of the following IBM 
xSeries:
- IBM xSeries 340
- IBM xSeries 240
- IBM xSeries 230
The system is any of the following IBM Netfinity servers:
- A Netfinity 8500R server, type 8681, any model
- A Netfinity 7600 server, type 8665, any model
- A Netfinity 7100 server, type 8666, any model
- A Netfinity 7000-M10 server, type 8680, any model
- A Netfinity 7000 server, type 8651, any model
- A Netfinity 6000R server, type 8682, any model
- A Netfinity 5600 server, type 8664, any model
- A Netfinity 5500-M20 server, type 8662, any model
- A Netfinity 5500-M10 server, type 8661, any model
- A Netfinity 5500 server, type 8660, any model
- A Netfinity 5100R server, type 8656, any model
- A Netfinity 5000 server, type 8659, any model
- A Netfinity 4500R server, type 8656, any model
- A Netfinity 3500-M20, type 8657, any model
Workaround
If there is one DIMM in the system the memory row/bank may be disabled when there is a memory failure. The system will not boot because it has no memory to use. If the DIMM is replaced with one of the exact same type and size, then the system will continue not to boot. BIOS cannot tell when a DIMM has been replaced with one of the exact type and size, therefore BIOS believes it is still the bad DIMM and will not use it.
Here are two possible workarounds:
1. After replacing the defective DIMM, continue to reboot the system until you hear the "no memory" post beep sequence (3-3-3) during POST (no video display). After three (3) incomplete boots, a "062 three consecutive boot failure. Using default CMOS configuration caches are off" error will occur. At this point BIOS will go back to the default settings and begin to use the new DIMM. However, if you have disabled the 3 boot fail count (this setting may not be available in all servers) in Setup, then BIOS will not turn the DIMM row/bank back on.
-=OR=
2. Remove the DIMM. Power on the system until the "no memory" post beep sequence (3-3-3) is heard. The memory row/bank will now be marked as being empty. Power off the system and put a good DIMM back into the system. The memory DIMM row/bank is re-enabled and the system boots normally.
NOTE: If more than one DIMM (or more than one DIMM set) is installed in the server and one memory (or one memory set) row/bank is disabled due to a memory failure then, the user must go into setup and re-enable the row/bank after replacing the bad DIMM.
Additional information
Memory DIMM rows/banks are not automatically re-enabled when a bad DIMM is replaced. Therefore, if only one (1) DIMM is installed in the server, the server may not boot and may give a "no memory" POST beep sequence (3-3-3) even after the bad DIMM has been replaced with a good DIMM of the same size.
For interleaved systems (Netfinity 6000R, 7100 and 7600), it works in a similar manner. If one (1) DIMM in a set has been disabled due to a memory failure then the entire set will be disabled. If that is the only memory set in the system, then the system may not boot and may give a "no memory" POST beep sequence of (3-3-3) because it has no memory to use.
NOTE: This will occur even after the bad DIMM has been replaced with a good DIMM of the same size.
Older System x:Operating system independent / None
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