@lesliebrow19476 there should not be a 12V rail. The 2.5" laptop HDD typically uses only 5V. Double check with another drive since this issue is either your drive, or a bad master boot sector. You are not telling us if the drive is being seen in the BIOS.
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We will need to know the exact model of the motherboard. It should be printed right on it. The laptop make and model will not give us the results we need to work on a schematic.
@lesliebrow19476 there should not be a 12V rail. The 2.5" laptop HDD typically uses only 5V. Double check with another drive since this issue is either your drive, or a bad master boot sector. You are not telling us if the drive is being seen in the BIOS.