Ah the fact that you can't even format it tells me one of two things
1) Bad SSD
2) Even though the enclosure works it may not be compatible with the drive.
The only other thing I can think of is maybe get a different IDE/SATA to USB Adapter or get a 44 Pin to 40 Pin adapter and try to connect it directly to a IDE Cable if you have a PC that has a IDE on it to test it really. This is one of those things where it is hard to really diagnose over a forum and not in person but it sounds like it is one of the two things i listed to me.