Hardware Reference
In-Depth Information
Figure 6.21. For accurate results, before testing memory the CPU Internal (L1) and External
(L2) caches should be disabled in the system BIOS Setup on systems having this option.
Tip
Most systems do not permit you to disable cache in BIOS setup. In such cases, I recommend
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 diagnostic,
your memory has tested okay in hardware. Be sure at this point to reboot the system, enter the
BIOS Setup, and re-enable the cache. The system will run very slowly 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 larger PC repair shops have such a tester. I
would also check the software (especially drivers, which might need updating), power supply,
and system environment for problems such as static, radio transmitters, and so forth.
