Inspiron N5010 - Just replaced hard drive, won't power on

I just replaced the hard drive in my n5010 and when I plug it in it shows that the power cord is charging the computer.  However, when I press the power button nothing happens. There is no light, no sounds, nothing. Did I reattach something improperly when I reassembled the computer?  Should I just give up and buy a new  computer?

Thanks.