Memory Checkout

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

Memory Checkout

Memory Checkout

Depending on the amount of additional memory installed by the customer, the memory size that is available for customer use appears differently. This is not a hardware problem. Consult the following table for the available memory on a system with a 4MB base memory when the customer installs different sizes of small outline dual inline memory module (SO-DIMM).

SO-DIMM Installed Total Memory Available Memory None 4MB 3712KB 4MB 8MB 7808KB 8MB 12MB 11904KB 16MB 20MB 20096KB

SO-DIMM Installed	Total Memory	Available Memory
None	4MB	3712KB
4MB	8MB	7808KB
8MB	12MB	11904KB
16MB	20MB	20096KB

The following table shows the available memory on a system with an 8MB base memory with different sizes of SO-DIMM.

SO-DIMM Installed Total Memory Available Memory None 8MB 7808KB 4MB 12MB 11904KB 8MB 16MB 16000KB 16MB 24MB 24192KB

SO-DIMM Installed	Total Memory	Available Memory
None	8MB	7808KB
4MB	12MB	11904KB
8MB	16MB	16000KB
16MB	24MB	24192KB

Memory errors might stop system operations or cause error codes to be displayed.

Use the following procedure to isolate memory problems:

NOTE: Make sure that the SO-DIMM is fully installed in the connector. A loose connection can cause an error. For more information about installing SO-DIMMs, see 'FRU Removals and Replacements'

Power-on the computer. Press the F1 key any time while the POST memory count is proceeding. At the end of the memory test, the Easy-Setup screen screen appears.
Select Test and press Enter.
Press Ctrl+A to enter advanced diagnostics.
Select Memory and press Enter to run the memory test on base memory.
- If an error appears below 3712KB on a system with a 4MB base memory (7808KB with an 8MB base memory), replace the bottom system board.
- If an error appears above 3712KB on a system with 4MB base memory (7808KB with an 8MB base memory), replace the SO-DIMM.
If after replacing the SO-DIMM, an error above 3712KB on a system with a 4MB base memory or 7808KB with an 8MB base memory still appears, replace the bottom system board.
To exit from the test screen, press Esc.

If memory problems occur intermittently, use the loop option to repeat the test. For more information on running the loop test, see 'Running the Diagnostics' When the test detects an error, an error log is printed on the printer connected to the parallel port. See 'Printing and Displaying Error Logs' for more information.

Do not replace FRUs because of a single, nonreproducible failure. Single failures can occur for a variety of reasons that have nothing to do with a hardware defect, such as electrostatic discharge or software errors. Consider replacing a FRU only when a recurring problem exists. If you suspect that problems besides a failing FRU exist, clear the error log and run the test again. Do not replace any FRUs if errors do not reoccur.

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