Is your laptop still under warranty? If yes, you should contact the reseller, because I agree with xpcman, that the drive may have failed and changing any part may void your warranty. If you have no warranty left, you can get another 2,5'' hard drive. You should confirm the height of the hdd slot of your laptop, but I presume that a 9.5 mm drive should do the job, but you need to confirm that.
If you remove the drive from the VAIO, try to connect it to another PC. You can do that with a SATA connector or with a SATA to USB cable, directly to the USB slots. You should confirm if the drive is spinning and is working mechanically. After that you can check if the drive is visible by another PC, or check different OS, like Linux Live CD.
Hope this helps