With the fault info provided it is far too early to go blaming everything on your hard drive. In fact, if all you are seeing on the screen from power on is a flashing cursor then there is a fair chance that it is not your hard drive at fault.
Have you recently performed any BIOS updates on your PC. Is there possibly a poorly seated PCI device in one of your PCI slots or any other peripheral which may have got loose.
If you have a floppy drive try inserting a floppy into it and then power on. If you get an error message then it probably is your Hard drive. However, if all remains the same I would probably move onto memory from there.