I can add to what @Sushubh has mentioned since I had a Similar experience. Ordered an external drive case, power adapter made a strange hissing noise. Asked for a replacement, different adapter still same issue. Since I had a 12V 1A adapter from my other drive, used it, it functioned properly.
In the name of cost cutting they forget basic stuff like these. While hopefully this shouldn't be the case, its better to keep this in mind. Check the power rating of your adapter(should be 12V 2A) and if you have another adapter with same power rating try this and note your observations.
In the name of cost cutting they forget basic stuff like these. While hopefully this shouldn't be the case, its better to keep this in mind. Check the power rating of your adapter(should be 12V 2A) and if you have another adapter with same power rating try this and note your observations.