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As the previous poster said (I do not know which topic, because you have invaded all topics with your problem), it can be a connection problem.
Disassemble it, pull out all connectors, wipe and rub with alcohol, push back them.
Regarding the type of the problem, it is possible that the disassembly-assembly could help alone.
If not, follow my advices in other topic (with the original question).
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