It's highly likely it hasn't been tested with your mobo. The fast ram settings work on XMP profiles. You may not be able to use this given the mobo is a HP generic/locked mobo. However, if you have voltage controls for the mem, you might be able to get them to work.
You need to go to the bios and set the memory voltage to 1.5v. If the mobo allows you to change memory timings, this is even better. Then you need to input the 5 timings printed on the side of your new DIMM into the corresponding setting in the bios.
Once you have done this, reboot, there is a chance they will work. Not guaranteed though. If after doing those steps the mem doesn't work then there is nothing else you can do, but return the DIMM for a refund.
The mobo is only rated for 1333mhz. So you may also need to set the ram speed at that.
It is also worth updating the BIOS for the mobo from HP's website. This will ensure the latest compatibility for the ram, and might help getting them to work.