8GB memory not being seen in 64 bit ubuntu

[sbquinn]

I have 8GB installed in my machine. It sees it on boot and post shows 8192. I
have the 64bit kernel installed but ubuntu only recognizes 3.2GB.

Free:
free
             total       used       free     shared    buffers     cached
Mem:       3347076    1517968    1829108          0      25616     549916

uname -a
Linux takiyok 2.6.27-11-generic #1 SMP Thu Jan 29 19:28:32 UTC 2009 x86_64
GNU/Linux

System > Administer > System Monitor
Also reports:
Release 8.10 (intrepid)
Kernel Linux 2.6.27-11-generic

Memory: 3.2 GiB

Any help to enable the full 8gb would be appreciated
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