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The system hangs up while trying to boot the hard disk when it is first booted after turning it on, but will boot after a warm reset
Explanation: The system will only boot the hard disk after a warm reset is performed when it is powered on for the first time. It will not boot the first time that the power is turned on.
Diagnosis: There are many possible reasons for a hard disk that fails to boot. If a warm reset consistently fixes the problem, however, then this implies that the system is trying to boot the hard disk before it is ready to operate. It takes several seconds for hard disks to come up to speed when they are first turned on, since they must spin up to speed, and then several internal calibrations and tests are often performed. Older BIOSes took thirty seconds or more to complete their power-on tests and boot the operating system, but newer ones can do this in ten seconds or less. Some of these BIOSes are smart enough to wait for the hard disk to signal that it is ready and then will boot, but older ones may hang up.