Hello Pmaciver,
The first thing to do would be to boot into the right kernel if you want suspend. If you do not care about suspend...Well I am not sure to be honest. You can install a 64 bit OS which will recognize the 4G of RAM or you can try and enable PAE in the kernel. Ideally, we would be able to get you into the 2.6.30 kernel (Suspend works in this kernel) as well as having the OS recognize the 4G of RAM. Unfortunately I have never dealt with PAE or 4G of RAM on Ubuntu so I cannot really advise on that one =/
If you were to go with the 64 bit Ubuntu install, you can get the 4G of RAM as well as suspend functionality you would want the below.
Code:
$ wget -c http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/linux-headers-2.6.30-020630-generic_2.6.30-020630_amd64.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/linux-headers-2.6.30-020630_2.6.30-020630_all.deb http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/linux-image-2.6.30-020630-generic_2.6.30-020630_amd64.deb
$ sudo dpkg -i linux-headers-2.6.30-020630-generic_2.6.30-020630_amd64.deb linux-headers-2.6.30-020630_2.6.30-020630_all.deb linux-image-2.6.30-020630-generic_2.6.30-020630_amd64.deb
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