Hey there, jclay64.
If the hard drive can't power-up at all, the best and most reliable solution would be a data recovery company. The only other thing you could try is a PCB swap, which I wouldn't recommend. You'd need to take the PCB from the exact same drive model and replace the one of the failed HDD and there are still no guarantees that this would work.
Hope that helps.
Boogieman_WD