Unable to get sound into PC

I recently decided to do digitize my old audio cassettes using an old Tuner/Amp and Cassette Deck. I can hear audio through headphones from the deck and from the amp but unable to get visual or audio into Audacity on my PC Win 11. I have tried the Outputs from both the deck and amp. I have also tried connection to PC via SoundCard Line in and PC Mainboard Line in.
In Audacity I have selected appropriately one or the other in Audio Settings but still nothing. Can someone steer me in the right direction please, thanks.

Check your Windows Privacy Settings for the line inputs.

You can also try Listen To This Device to make sure Windows is getting a signal.

And while you’re at it, make sure Windows “enhancements” are turned OFF. (They usually don’t kill the audio altogether but they can cause all kinds of weird problems.)

Thank you for your reply. Everything still no-go. I suspect I have another software interfering. I have Hauppauge USB Live2 installed to digitize analogue video’s and maybe this has “taken over” everything audio…! All very frustrating.

…Not ideal, but that should work with no video plugged-in (or with some unrelated video playing).

But you’ll have to use the Hauppauge software and you’ll get a (lossy) MPEG-2 or MPEG-4 audio video file. Then if you haven’t done so already, you’ll need to install FFmpeg or Audacity to open the audio from the A/V file, and then you can (optionally) edit and export to whatever format you want.