Laptop not turning on after cleaning the fan

[cstehreem]

I have dell Inspiron (15R) 5537. Last night I wasn't able to turn it on, I was able to hear fan's sound quite loudly and then after a few seconds it would turn off. I opened it up cleaned the fan and assembled it back according to this video and its not turning on at all now. No lights no sounds nothing. Its getting charged though. Can anyone point me to where do I start debugging?

 

[CountMike]

You must have missed some connection. Check it's proper manual, not some youtube s***: https/www.manualslib.com/manual/889232/Dell-Inspiron-15.html

 

[cstehreem]

You must have missed some connection. Check it's proper manual, not some youtube s***: https/www.manualslib.com/manual/889232/Dell-Inspiron-15.html

Oh right. I was wondering where I could find something like that. Thankyou