My Book Pro Stopped Powering Up

Can you upload a detailed photo of the component side of your circuit board to a file sharing service?

With any luck, your drive will have an open fuse (or fusible resistor) plus a shorted protection diode (TVS) near the SATA power connector.

The fix is to bridge the fuse and remove the diode. The drive will work perfectly OK without the TVS diode, albeit without protection on the affected supply rail.

See the following article for help in identifying the components.

HDD from inside Main parts:
http://hddscan.com/doc/HDD_from_inside.html