Hardware Reference
In-Depth Information
Tip
SomesystemsdonotpermityoutodisablecacheinBIOSsetup.Insuchcases,Irecommend
using Windows Memory Diagnostic and use its advanced options to disable cache before
testing memory.
4. Follow the instructions that came with your diagnostic program to have it test the
system base and extended memory. Most programs have a mode that enables them
to loop the test—that is, to run it continuously, which is great for finding intermittent
problems. If the program encounters a memory error, proceed to the defect isolation
procedures.
5. If no errors are encountered in the POST or in the more comprehensive memory dia-
gnostic, your memory has tested okay in hardware. Be sure at this point to reboot the
system,entertheBIOSSetup,andreenablethecache.Thesystemwillrunveryslowly
until the cache is turned back on.
6. If you are having memory problems yet the memory still tests okay, you might have
a problem undetectable by simple pass/fail testing, or your problems could be caused
by software or one of many other defects or problems in your system. You might
want to bring the memory to a module tester for a more accurate analysis. Some lar-
ger PC repair shops have such a tester. I would also check the software (especially
drivers,whichmightneedupdating),powersupply,andsystemenvironmentforprob-
lems such as static, radio transmitters, and so forth.
Memory Defect Isolation Procedures
To use these steps, I am assuming you have identified an actual memory problem that the
POST or disk-based memory diagnostics have reported. If this is the case, see the follow-
ing steps and Figure 6.19 for the steps to identify or isolate which module is causing the
problem.
Figure 6.19 Follow these steps if you are still encountering memory errors after completing the steps in
Figure 6.17 .
 
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