Decision flow (safe)
- Reproduce the symptom reliably.
- Check software/driver causes first.
- Confirm if screen-linked signs are present.
- Escalate to service when risk is high.
Directional cases
- Brand sample: Lenovo · confidence medium · risk high
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DIAGNOSTIC NOTE
Phone: Blue Screen
Possible cause: screen. Start with low-risk checks and avoid disassembly unless trained.