If no hard drive is detected upon startup, the first thing to consider is the hard drive itself. As soon as the hard drive is powered on, it operates continuously, spinning at speeds of over 5,000 revolutions per minute. Such mechanical structures are prone to malfunctions. When detecting the hard drive in CMOS, listen to the sound it makes. If the sound is: "click... click... click..." and then it becomes quiet, operating normally, there is a high possibility that the hard drive is likely fine. It could also be due to insufficient power supply. If the sound is "click... click... click..." followed by several consecutive "clack... clack" noises, there is a strong chance that the hard drive has failed, and the read/write head is damaged. In this case, the only solution is to replace the hard drive. If data recovery is needed, professional disassembly and data recovery services are required.

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