I can think of 2 things right off: bad memory or BIOS age is limiting
memory slots to only recognize a max of 128MB per slot (usually a BIOS
update can increase it). Also, as it has been a while since I've messed
with a PC with SDRAM, they may need to be install in pairs. I looked into
my old Desktop running Fedora Core 3 Linux and it has 512MB total, 4 128MB
modules of PC100, so I may be wrong on the pair's thing, but everything else
I have is running either DDR2 RAM or older RDRAM, both which require
inserting in pairs of same size.
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