If everyone replied saying "I don't know" then all threads would be too long.
I don't have one so I'm only guessing by googling
If listed under settings->sound when using USB then do system sounds play?
Does Application-> utilities-> audio MIDI setup app help?
Try on another computer
is the drive visible in the BIOS? does it make clicking noises?
check out these 3 other data recovery options to see if they are able to access the drive
Maybe you have a hard ware issue
Don't overclock ram.
Check bios temperature readings
See if your hd or ssd power connection is firm
Update ssd firmware if possible
Run a memory test.
Try another USB key
What version of clover?