It sounds like the hard drive died on you or the cable is bad.
Try changing the cable first. If that doesn't fix it then remove the hard drive and 
slave it to another PC.
If it shows up in My Computer and you can navigate around in it, then Windows is 
causing the blue screen. Transfer any files you need to a DVD/CDs or an external 
hard drive while the hard drive is slaved to the second PC.
Now reinstall the hard drive back into your Dell and use the system restore disks 
that Dell supplied with the PC.
Once it's done the restore, you can copy the files back on the Dell.
You can also use memtest (Google search,download, burn to CD, and boot to the CD) 
to test the memory before you attempt the above.
If none of this works, then it's time to buy a new hard drive.

Good luck! 

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