HP DM3 - 3000 Power Button not working, Laptop turns on itself while connecting power cable

I disassembled my laptop for cleaning, reassembled. Now there is a problem with power button. I thought i connected the cable loosely but i rechecked it again. cable looks fine as well. When i press the button, LED doesnt glow up. 
This is the board 
HP Pavilion dm3-3000 Genuine "Beckham" Power Button Board with Ribbon 48.4KD05.011
can it be tested or repaired ? or the problem lies in something else ??? the laptop turns on without pushing the power button , when i connect the power cord from the mains, with battery it does not turn on but after it is turned on, it works with the battery too, when i remove the power cord. 
PLEASE HELP

Seems like the operating system is not loading , Can you try accessing Bios Settings and see if the HDD is still detected ?? try accessing safe mode as well .
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