Did you actually see the Tiger Direct tech successfully boot from the drive, or is it just what he's told you? I'm not totally sold on their opinion that the drive is okay.
You should test it with the drive manufacturer's diagnostic software for DOS.
The links are here: http://www.tacktech.com/display.cfm?ttid=287
The DOS versions are usually ISO files from which you can make a CD using IMGBurn from here: http://filehippo.com/download_imgburn/
Boot your problem PC from that CD to run the test on the drive. Choose the long or extended test if available rather than a short test.
If the drive checks out okay, well at least you'll know that much for sure, rather than taking someone else's word for it.
You should test it with the drive manufacturer's diagnostic software for DOS.
The links are here: http://www.tacktech.com/display.cfm?ttid=287
The DOS versions are usually ISO files from which you can make a CD using IMGBurn from here: http://filehippo.com/download_imgburn/
Boot your problem PC from that CD to run the test on the drive. Choose the long or extended test if available rather than a short test.
If the drive checks out okay, well at least you'll know that much for sure, rather than taking someone else's word for it.