I fixed my TV's flickering black screen with a $15 HDMI cable and a hidden menu setting

Flickering black screens on 4K/120Hz TV setups are often caused by two overlooked issues: physical HDMI cable sag creating microscopic pin gaps that break the HDCP handshake, and TV ports left in standard/compatibility mode that block full HDR bandwidth. The fix involves supporting cable weight with a Velcro tie, using a certified Ultra High-Speed HDMI cable (look for the official QR/hologram label, not marketing claims), and enabling enhanced HDMI mode in TV settings. If an AV receiver is in the chain, it may be the bottleneck — bypassing it by connecting the console directly to the TV and using eARC for audio can resolve both video and signal issues.