AGP Slot on P4P800 Deluxe

Is there anything you have to do to lock in a video card on this slot? All
I did was push the card down into the slot -- but I thought I read something
about a locking mechanism or something.

I installed it like any PCI card -- just lined up the card over the AGP slot
and pushed down.

Did I not do everything I should? There appears to be some white plastic
along the AGP slot, but I'm not sure what it does.

The card works and is seen in device manager (the fan seems to be dying
though -- it starts and stops).

Note that my p4p800 deluxe is the revision 2.00a version.

Please let me know if you need to do anything else regarding locking the
video card in the AGP slot?