Hey there, Upul_1.
This could be a tough issue to troubleshoot. So start with checking if everything has been properly connected (make sure that you haven't dislodged a memory module by accident as well). Try resetting or updating your BIOS (some users have been known to fix the problem with a BIOS update). Try the drive with a different computer to see if the same issue occurs, or at least with different cables and a different SATA port. Try changing the CMOS battery.
It could also be some sort of incompatibility issue and if this is the case you should get in touch with the computer manufacturer to see if the drive is not compatible with the motherboard for some reason (even though it's not very likely).
Hope that helps. Please let...