3.5mm jacks are not all the same, even if they have the same number of rings. You need to get a 4 conductor cable.
"You still should have gotten at least one channel using
the mono cable? Was it pressed all the way into the jack?"
Not in this case. Mono is 3 conductors, not 2. And stereo is 4 conductors, not 3. You need to get a cable that has 3 rings and is labelled TRRS. If it doesn't say TRRS, the cable won't work.
"You still should have gotten at least one channel using
the mono cable? Was it pressed all the way into the jack?"
Not in this case. Mono is 3 conductors, not 2. And stereo is 4 conductors, not 3. You need to get a cable that has 3 rings and is labelled TRRS. If it doesn't say TRRS, the cable won't work.