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go to bios settings by pressing F10 for hp .. there select the optimal factory defaults.and engage and also save settings with F10 ...and exit ..This will get rid of any wrong settings made in bios ..related with he fan ..and should start proper..The only thing that can malfunction is caused by a higher temperature to start ,, and never get to it .. If it still makes the same ..you should consider changing it ..or see the wires to be proper inserted..cause it has 2 for power and one for starting..and can be damaged..but still functional when you check it ..just the wire for the start to be damaged or not making contact .. ..
try to remove your memory/ies. then plug it to ac power without battery, if it turns on try to unplug and put back the memory module (one by one if more than 1). plug and switch on if it works then put everything back if not, you ned to replacethe memory.