If I have to shut off every light in the house and disconnect all digital sources every time I want to spin a record, then I'm done playing vinyl.
Hopefully it is only one of those things that is causing the problem. After turning everything off, if the problem disappears you would then incrementally turn things back on until you determine which of them is the cause.
The quickest way to do that is by means of what is referred to as a "binary search pattern." You would turn half of the lights and other things back on. If the problem returns you would know it is being caused by something in that group. If it doesn't return you would know it is being caused by something in the other group. Then you would turn on half of the things in the suspect group, which would allow you to isolate the cause to 1/4 of the number of things that were originally turned off. You would continue that process until you isolate the specific cause.
I have experienced some instances where compact fluorescent lights that were in marginal condition, toward the end of their useful life, emitted large amounts of RFI, while the same model bulbs in new condition did not.
Regards,
-- Al