A pink vertical line usually points to a display panel or display signal issue.
Common causes
- Physical damage to the panel
- Panel defect / aging
- Flex cable/signal issues (especially if it changes with lid movement)
Quick check
Connect an external monitor:
- If the external monitor is fine, it’s likely display/cable related.
- If the external monitor also shows issues, it may be GPU/logic board related.
Share your MacBook model/year and a photo of the screen for faster guidance.