Thank you for using our online forums here. I apologize about the issues you are having in regards to finding a working remote for your Directv HR23-700. There are a few things you can try, first have you gone into the menu options on your remote or settings and then find remote control and make sure it is set to IR instead of RF? If it is, have you tried to go in and test an alternate Directv remote?
Hope this helps, please reply back if you have any more issues.
The Sling Moderation Team