How to repair nokia 8600/Luna , turning off, blank screen, restart 1. Turn off your cellphone
2. Check power switch (on/off switch), replace switch if needed
3. If the problem not solved, check engine/board for water damage
4. Clean board and test
5. If the problem not solved, upgrade firmware (with a latest one)
updating firmware need flashing box (like ufs3, jaf, MT box, etc)
6. If the problem still not solved, main engine prabably problem, swap engine.
suggestion: Nokia 8600 luna premium care, it covered 24 month, when you get problem check warranty first. If you are under covered warranty, bring your cellphone to nokia care center.
