A loud bang in the garage followed by an unyielding door usually indicates a snapped lifting cable. Over 85% of garage door cable failures happen while the door is fully closed. When closed, counter balance springs are at 100% peak strain, exerting maximum tension on galvanized steel cables. If a cable snaps under this load, a trapped vehicle or stuck door requires immediate triage.
Before taking action, avoid pressing the automatic opener button again. Attempting to motor-drive a door with a snapped cable increases the structural stress on the remaining hardware by 100%, risking track twisting or motor burnout.


