It sounds like it might be a wiring issue with the car sled. The player is likely not getting enough voltage to spin up the hard disks, at least not on the wires it needs to use to do that job. This might be because the sled has been incorrectly wired to the car, or it could be a fault with the sled's docking connector. Or it might be something as simple as using a heavier gauge wire to the car's battery instead of whatever it's currently connected to. Please scan through the Troubleshooting section of the FAQ (linked at the top of this page) and see what you can glean from that.