Solid State Drive Upgrade?

So I feel pretty dumb here because I asked something like this before, and it did work for a little while, but all of a sudden, stopped working. I have an iPod classic that I'd like to give to a friend that I have no working hard drives for. I bought this Super Talent 128gb zif drive to put in and see if maybe it would work. I've always preferred ssd's. My question is what am I doing wrong here? I'll tell you everything I've done.

All new click wheel and casing, 128gb label on back plate from China.

Same battery that worked before.

Used logic board bought from eBay.

Super Talent SSD.

I did all the work thanks to these great guides and it worked for a little while. I went to use it one day and it gave me the red X of death. Usually indicative of a hard drive failure, as I understand it. I tested the ssd on my computer and the computer wasn't even seeing it. I contacted Super Talent to get an RMA replacement. Replacement shows up. SSD can now be seen in my computer, but I get the same red X of death on my iPod screen after I install it. SSD is 3.3v and I've tried different hard drive cables since I have a treasure trove of old iPod classic parts.

Is this a logic board failure or a hard drive failure?