From my experience, I have encountered a rapid tapping sound come from a faulty optical drive as well as from a bad hard drive. In this case it seems like your hard drive has given up as you mention that you cannot view thumbnails or play existing recordings. If your drive makes a rapid or frequent tapping sound with no disc loaded, then it is very likely the hard drive that has failed since the optical drive stops operating within a few seconds without a disc.
I attached an audio clip of a bad Maxtor hard drive. With this drive, it makes a continuous tap.tap.tap sound for a minute, pauses a few seconds and then makes a rapid tap-p-p-p... sound like a pneumatic hammer-drill. The recording has both examples.
If you cannot view any recordings on the LiteOn and the recorder makes noises upon powering on, then there is very little hope in being able to recover the recordings. However, if the recorder remains silent for a while upon powering up, then chances are that its FAT has gone corrupt and it may be possible to pop the drive into a PC to use a 3rd party file recovery tool to recover the contents. Just be warned that removing the hard drive will likely invalidate any warranty on the recorder. :rolleyes:
I'm only a new mod to this particular forum as I have recently reviewed a LiteOn LVW 5045.
BadHardDrive.zip (35.2 KB)