Dell Studio 1749 Power button replacement

My Studio 1749 has a power button that is not working correctly.  It seems to be broken and only powers up with the power supply connected and if I depress the button on one side (the side of the button that is slightly inverted into the laptop).   Is there a replacement that I can order?  I did download and run the hardware disgnostics tool and it reported that everything (disk drive, memory, etc) are functioning normally.  Thank you!