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Thank you for posting your concern in the Community. No audio output can surely be disappointing; we can look into finding the solution for you. Would you please provide the following info?
Looking forward to hearing from you.
...The guy at rogers told ke the older pvr have no serge protection.
None of the Rogers boxes (or the boxes from any providers) have surge protection. If you have a PVR I always recommend plugging it into the battery side of a UPS (Uninterruptible Power Supply), which will keep the PVR up during a power failure, precluding a Hard Drive crash if the hard drive is working at the time. Other equipment, like a TV, that uses more power should be plugged into the "surge only" side of the UPS, but the UPS will provide some surge protection for everything plugged into it, although a major surge may damage any equipment that is plugged in at the time the power comes back on. That's why if there is a long power outage, you unplug all the electronics in your home until after the power comes back on and the voltage has stabilized. A small UPS can usually be purchased for $50 or less on sale.
I wouldn't have thought that would affect the audio though. I would expect there may be a poor connection at the HDMI cable in which case unplugging and replugging the cable at both ends may help remove any oxidation which may lead to poor contacts/signal and no audio (or video) in some cases. Also, a box reboot may help with the situation. You can also try going into the Settings - Audio menu and switch the audio options to "other" if on Dolby Digital or vice versa, then back again to your preferred setting - this may "wake up" the connection.
I had this issue with an LG TV. One day, no sound. It was an odd problem because Chromcast worked with no issues on all HDMI ports. But Rogers Cable Box was a no go.
I did the following;
I now have a fully functional LG TV, Rogers Cable box, Chromecast and Laptop.
Hope this helps someone else!