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Can a hard disc failure prevent POST?

ddantes asked
Recently, one of my antiquated computers failed to boot.  Nothing appeared on the monitor, although the HDD LED showed continuous illumination.  One of the hard drives was making a periodic clunk, so I removed the power connector from that disc, and then the system booted up.  I am unclear how a hard disc failure can prevent the system from performing CMOS functions.  How is that possible?
Watch Question

A hard disk can fail and cause the computer to not have a "PowerGood" level from the power supply. Without PowerGood, the BIOS will never start. Removing the cables from the hard drive restores PowerGood and the machine tries to boot.

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