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Thanks for the suggestions. I won't be trying it on a different monitor, simply due to the fact that I don't have one. I've tried different cables and no luck.

I also tried Neo-Freeman's suggestion and it didn't change anything as well. When I re-enabled my motherboard audio, Windows recognized it as spdif, but obviously no sound was provided since I didn't have my motherboard's audio options plugged into my TV. The ARC's audio option was not even recognised in the audio options, and the same step of disabling it then re-enabling it in device manager got it working again.