HDD detection problem

I have a samsung 40 gb hdd. I am facing a very peculiar issue with it.
If the HDD is kept in the cabinet (it is kept in a horizontal position in the cabinet and is screwed on the sides.) my BIOS doesnot detect it.
But if i take it out and keep it on my desk(in horizontal position) , then the BIOS detects it easily.
Can this be pointing towards a disk failure happening in future.

What should be done to rectify this