OWC says that shorting out two leads on the drive connector can solve the Apple Hardware Test failure issue, but that's a step farther than we were willing to go. There is also a that provides the needed hard drive temperature information to the motherboard.

The vast majority of Mac owners turn to Apple for simple, pre-configured systems that they can set up and use without worrying about such things as shorting out pins, third-party fan utilities, or suction cups. These users are much more likely to connect an external USB, FireWire, or (soon) Thunderbolt drive if they need extra storage space.

But what if your hard drive fails after the warranty period expires? On this model, your options are much more limited. When the hard drive fails, you're going to be faced with making a painful upgrade or--more likely-- shelling out the money for a new Mac while junking the old one.