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- checked the power and SATA cables and they appeared to be securely connected.
- replaced the SATA cable and connected it to a different port on the MB. - no change
- removed the D: drive and the system booted normally
- connected the HDD to a different computer and the boot process was very slow. The HDD did not appear in file manager. It also did not appear in Disk Management. It also did not appear in the BIOS.
- The HDD has always been very quiet so it is hard to be sure but I can feel a little vibration from the disks spinning when powered up.
Therefore, since my ASUS system boots correctly without the HDD and it is not recognized when installed in another computer , my assumption is that the HDD is dead. Correct?