After you format and reinstall Kmeaw, if the drive still wont show the icon. i would recommend taking the drive apart (depending on if you think you can disassemble it without damaging anything). take the metal casing off the drive and then remove the top plastic plate from the blu-ray (like 6 small phillips screws), then manually put the disk on the spindle and the magnet on top (so disk does not spin off like a frisbee) and make sure all drive connections are secure, then power on PS3 if the laser works you will be able to see the violet laser through the disk. Again its not too hard to disassemble the drive, just make sure your confident enough in not destroying it before you start.
Let us know how it goes and while your in the drive if you determine the laser is bad, get the part number off the tray the laser sits in. it will be begin with either kes or kem (if its a fat model, not sure on the slims) and good luck with it.