It's quite typical to be able to revive SSD's by just applying power to them for an hour and then pluggin them into an USB socket. A standard and cheap USB to SATA adapter is great for that.
Now that being said from your descritpion I would say that the SSD is gone. Considering just how powerfull computers are now a days a 3 years old computer doesn't seems that old to me. Since SSD drive prices have fallen lately I would definitely want to invest a few bucks and replace the SSD. I usually go with Samsung 8x0 series and I'm happy with them.