Home Theater Static Noise Fix

I'm seeking an experienced technician to eliminate a loud, intermittent static hum or hiss from my home theater system. The noise resembles an electrical short.

Key details:
- The receiver/amplifier is suspected as the source.
- HDMI cables are suspected as potential culprits.
- The noise occurs randomly, not tied to specific media or volume adjustments.

Ideal skills and experience:
- Expertise in home theater systems, especially with receivers/amplifiers.
- Proficient in diagnosing and repairing issues with HDMI cables and connections.
- Ability to troubleshoot electrical noise in audio equipment.

Please provide a detailed approach for isolating and fixing the issue.