Memory conflicts

Hi,

I am upgrading a Dell Inspiron 4000 from 128Mb to 512Mb, but if I put over 256Mb RAM into the machine, it is then unable to access the network card and modem (both PCMCIA).

I have seen something about Linux not being able to handle large amounts of physical RAM, but is there a way round this?

redhat 7.1 is currently installed, and there are a lot of sofware set up on this computer, so I would like to be able to reconfigure rather than reinstall.

Thanks,
-gHoTi

Found the problem!

Apparently, under Redhat 7.1 there is a bug in the kernel.

Full details can be found at:

http://www.redhat.com/support/errata/RHSA-2001-084.html