Hello Arunas. Did you try a different cable and try the drive on a different computer? This way we can help determine if it may be the computer or the drive. If the drive still doesn’t show up, then it may need to be replaced. I included links below on how to replace a drive under warranty like you have requested
Warranty Check
http://wdc.custhelp.com/app/answers/detail/a_id/915
How to create an RMA to replace a drive
