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Systematically and methodically work through known methods to determine where the problem is; for example:
Comparison. Compare with a known good one to see where the differences are.
Process of Elimination. Use logic by swapping from known good to bad to determine where the faulty might be.
F.T.F.B. Read the flippin instruction booklet or file.
Technical Support. Contact the product maker/supplier via phone or logged online text call.
Best Guess. Keep changing stuff till something works again.
Shear Luck. Fixing something that was broken last week while trying to repair something broken this week.
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