I am having dell pc which has the western digital 500GB hard drive. Itâs now not working and not allowing me to boot to the operating system. So can anyone know what the problem is and other thing I want to mention is that it gives 4 times beeps which are actually like the siren while starting up the system? And after that the computer shows that the updates are not bootable. So can anyone tell what the actual cause of the problem is? Any help will be appreciated.