Hey All -
Before I launch into this, I just want to preface my comment by offering that data recovery services are too expensive for me, and that I'm willing to risk losing my data in favor of this low-cost approach to repairing my HD.
I have a 500gb Toshiba SATA HD in my Macbook that recently failed after something fell onto my laptop. I took it to a local repair shop and they could not fix it. Their report recommended sending it to a laboratory (too expensive

for me) and came with the following comments: The hard drive will not "spin up". The disk will not spin for reading purposes. Motor or circuit board damage prevents disk from receiving power and being read.
What could the possible problems be which prevent power from reaching the disk? A PCB issue? Could I attempt a replacement of the PCB if this is the problem?
I have very little knowledge about hard drives, so any reply with detailed information and photographs would be immensely helpful towards a successful repair. Even a referral to a website that has tutorials on this sort of thing would be unbelievably helpful. The current obstacle I have is that I am not quite sure what sort of "motor or circuit board" damage exists, and how I would remedy it. Please understand that I am a layman when it comes to this sort of stuff, but I am very willing to take every precaution and learn a lot about the process before I dive right in, so that I know what I am doing.
I've been told the problem is most likely one of the following: stuck spindle, stuck heads, damaged heads, or a damaged pcb. How would I identify which one of these is the culprit, considering I have no idea what any of these items look like? If I can diagnose one of these particular items as the issue, how would I go about repairing it?
Thanks so much for reading through this, and hopefully I will be able to learn a bit about how to go through with this.
You guys rock!