HP :: Hard Drive Is Making A Loud Noise On Envy 17 Laptop

I have owned my hp envy 17 laptop for almost 2 years now. Recently my computer has been making a really loud noise and it seems it is working a lot harder than it needs to be. I suspect the fan or the hard drive is the culprit but I have convinced myself it is the hard drive. 
 
When I start up my computer the loud noise begins almost immediately after startup. This noise sounds like the computer is working as hard as it possibly can, almost making a grinding noise. Even after the computer has booted up, this noise continues for another minute or two before it stops, then my laptop becomes quiet. What puzzles me, and leads me to believe it is the hard drive, is the fact my computer get unreasonably hot when the noise occurs; it never used to do this before. 
 
This situation is something I have never heard of before. My laptop for some reason ,when it is moved or bumped, even the slightest, start to "rev" and the hard drive roars; it does this for five minutes or so. It also does this when the laptop is closed, and in "sleep mode"; the slightest bump lets it off like a baby. I suspect that there is a switch, flap or wire that is not attached properly and when moved it triggers the hard drive. 
 
The main thing I do when the sound occurs is I close the laptop lid which puts it in sleep mode and turns off the hard drive, silencing it for the time being. This solution I came across by accident; I turned my laptop sideways when the sound occurs and the sound stops until I put the laptop upright again(Laptop is open).