Make sure your SATA cables are in working condition, and make sure the plugs are in the right slots.
One time my friend was having HDD problems and we couldn't figure it out. Then I swapped the SATA cable (for grins and giggles) and it actually worked. Turns out the cable was cracked and missing a pin on one end.
Intel Q9400 | Gigabyte EP45-UD3P | G.Skill 2x2GB DDR2 1000 | XFX HD5870
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