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> Dan,=====
>
> It sounds like your motherboard cannot support more
> than 256MB of RAM. The fact that you have the
> latest BIOS is great, but that cannot eliminate
> hardware incompatibilities. For example, I have a
> motherboard with two slots, filled with 512MB SDRAM
> DIMMs. Even though there are now 1MB SDRAM DIMMs on
> the market, I cannot use them, because the hardware
> configuration cannot address 1MB DIMMs, period.
>
> To try to explain, without getting overly technical:
> Each DIMM module has a number of signals coming to
> it to address the individual bytes of data in a
> row/column method. Each of these signals if
> connected to hardware in your chipset that keeps
> track of the memory being used, and the next
> location to be accessed. Depending on the memory
> used, the external signals may be used for different
> purposes. If I had to venture a guess, your PC has
> enough external signals/chipset hardware to address
> a 256MB DIMM, but only enough internal/external
> hardware to support 256MB of memory. This is why
> you can use 2 x 128MB or 1 x 256MB, but 2 x 256MB
> will not work. In a perfect world, the BIOS would
> compensate for this -- or at least, tell you that
> the memory configuration was wrong -- but it's
> difficult to support many different sizes of memory
> and detect wrong combinations, too.
>
> If you really want 512MB of RAM, you need a new
> motherboard. :^(
>
> Regards,
>
> -BW
>
> --
> Bruce Wahler
> Ashby Solutions� http://music.ashbysolutions.com
> CloneWheel Support Group moderator
> 978.386.7389 voice/fax
> bruce@...
>
>