I upgraded memory and then re-installed a fresh 10.10 and the BIOS shows 4gig but the System Monitor only shows 2.9 gig It says it is running Kernel Linux 2-6-35-24-generic-pae, The system is a Centrino Duo which apparently cannot run a full 64 bit kernel. But does show that it supports pae.

According to the doc re pae it should recognize the memory..

Any ideas, I'm stumped..

The system is a Toshiba satellite a105-s4074