Check everything ... and remember that if there's a proximity effect it's proximity to the antenna, not to the radio.
Also keep in mind that many devices, especially TV's and stuff, never actually have a real "off" switch. To fully cut power you have to unplug it.
I had a TV for a while that ONLY made noise on the ham bands when it was plugged in and turned off. If it was turned on it was fine, if it was turned off I got S3 to S5 noise on 15m with the beam pointed at it