Hello MDL, My friends PC has a HDD trouble as i guess. His PC's Description is: CPU: Intel Core i5-4570 3.2GHz RAM: 4GB HDD: 1TB The HDD has such sound: Tik Tik Tik and so on Also there is no HDD listed on BIOS. I opened case and change HDD sata cable to another port but same thing. a sound is still exists. What is a problem? Thanks in advanced for your time and support.