Compaq laptop won't turn on

I recently took my computer apart to clean the fan. The computer notified my that the fan was malfunctioning and would turn off and not fixed. I found an online tutorial to show me step by step instructions to disassemble my computer in order to clean the fan. After all said and done computer back together. The computer wont turn on. Does nothing in response. Computer turned on fine before. Everything is plugged back in and screws in place.
 
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