You may have a dead DIMM slot.  However, 256 Mb is more than sufficient for most everything most people do.  I would suggest that you limp along on 256 until such time as you really must have 512 Mb.  You'll be just fine with 256.

>Yes, both DIMMs are the same brand and PC133. The DIMMs aren't
>registered (i think). I tried each one separately and the result is
>amazing, both function very well and normal.
>


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