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If you are using two memory modules in your computer, make sure both are inserted properly. If you remove one and the system still works, you know which one is not inserted properly.

If you are using a 256 MB module, you may have purchased a low quality module made using "low density" chips. These modules use slower chips to produce a memory module. These are incompatible with most chipsets, and are not standards-compliant. They usually only work well in low-end systems.

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14y ago
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15y ago

* Some operating systems may only register up to certain amount of memory.

* You also may have the bios set to shared 1 gig of ram with the video card. * Your bios may not support more than 3 gigs. * wrong memory type inserted

Those are some obvious reasons

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