I've had issues before with loose cables and an insufficiently-powerful power supply. The latter is not relevant for this case. The former... is unlikely as well, considering the design of these computers, but you could try pulling the bay out and reseating it.
Do you have another computer you can plug things into? Even if it's not a laptop, you can use an adaptor to attach this drive to another computer - and then perform a disk health check, if it's recognized at all.
[product|IF107-108]