Well, if you have the Bell Nova remote, then you probably can control everything with it, assuming it responds to the 994 commands that allow one to manually assign additional functions to buttons.  I can supply you with the necessary EFCs, since the IR codes for all of your components are known.  You can start by using setup code TV 1494 for the HP, Video 0142 for the BDP 320, and one of Audio 0176, 1176, 1276, or 1376 for the Yamaha (which uses the same IR codes as the RX-V1400).  Choose an Audio code which controls Power correctly, probably 0176.

If you don't have a Nova (or another cable remote that contains all 3 setup codes), then it will probably be necessary to get a JP1.3 flash cable and e.g. a RCA RCRP05B remote. That will run $20-$25.  I can recommend a cable vendor. The RMIR software is free, and runs on Windows, Linux, and Mac.