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Laptop switches off randomly


My Dell Inspiron 15R 5520 laptop switches off at completely random times. I've given it for service 3 times and the frustating part is during their testing, it works completely fine so the repair guy can't figure out the problem.

After it switches off, it doesn't boot for a while and just gives black screen and a bunch off beeps. ( 7 of them at intervals)

I did a diagnostic and got a CPU fan error 2000-0511 Validation 130122.

Please let me know what is this issue and how to solve this. 



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