How to be Sure if a Hard Drive Is Blown

I got a new HDD the other day so I did some file moving
I cloned my OS from one of my 320GB HDDs to the new one then I deleted
all the files from the 320GB and moved about 120GBs from another HDD t
the 320GB HDD that used to have the OS on it. Everything seemed to wor
fine for a bit. I turned my PC off for a few hours and decided to mak
sure that all the SATA connector's were connected properly and untangl
some wires. I never even moved any of the HDDs. I restarted the comp an
looked in the BIOS and noticed that the 320GB HDD was not detected.
immediately thought that i'd neglected to connect something or mayb
that a wire was lose, so i turned the PC off and made sure all the wire
were fine. When that didnt work i took the wires from the working HD
and connected them to the 320GB. that didnt do anything so i connecte
it back to the working one and the working one was fine. That eliminate
the idea that it was bad wires. Then just to be sure that there wa
deffinately something wrong i connected the 320GB HDD by itself with th
working wires and took a look at the hard drive indicator light on my P
and noticed it was solid. It just stayed solid. The BIOS was no
detecting it

My hard drive is blown from excesive activity isnt it? There is nothin
i can do to fix it or at least get it working for a bit so i can remov
my files from it? Is there ANYTHING i can do short of paying hundred
for data recovery? The frive is still under warranty so I think I ca
get another one, but that data is so veru important to me. I really nee
some help here

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dannymichel