Power button doesn't work

I have a Dell Inspiron 17 7000 series.  When I turned off my computer yesterday it was working fine.  Today when I try to turn it on the power button would not work.  I took the back off of the computer and the yellow button by the power button was bent back.  I manually pushed the button and the computer powered up.  I then reassembled the computer.  I am now scared to turn off my computer incase I cannot power it back up.  Can this part be replaced?