Assuming yes, the obvious problem is your BIOS. If you are opposed to updating your BIOS you can always try this simple solution:
Boot up the machine.
Load the BIOS settings.
Press the key for Save and Exit.
Even though your BIOS might have detected your RAM it may have just needed a little push to get going.
Edit: So my initial assumption was right. I tried replacing the RAM and this issue just went away. It was a defective stick.