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HP Pavilion gaming 15 -cx0018nc

Hi, so I have a problem. My laptop doesn't boot up, instead caps lock blinks 5 long and 3 short, this should indicate to a problem with component being reached by bios according to hp support website. However after i performed all the recommended actions and removed the battery, it suddenly started and said CMOS checkup fail, then i could boot windows, this only happend 2 times, rest was just the same, black screen, blinks. I need to ask if my laptop does have CMOS battery and if so, where, because i red it could be the solution as well. Thanks for advices 

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