My phatbox is doing exactly the same as this. The only light that ever comes on is the red one. Red Light comes on it spins up the drive, stays on for 5 seconds or so and then stops, light goes off. About 15 seconds later it repeats this process.
My DMS is not hacked and was working. I hadn't used it for a while and now it doesn't seem to work at all. As others have said the drive seems to work fine in the cradle on my PC, but I never see the Green light when it is in the car.
I have just taken the heat sink off and checked the cables they seem fine, and I couldn't push them back in at all. I also put the rc.sh and rc.sig in the root of my PHTSYS and a bootload.log, but nothing ever appears in here.
Anyone have any other suggestions?
Thanks.