QUOTE(duhasst0 @ Sep 28 2012, 03:21 AM)
Check and make sure the sata and power cable are installed correctly and firmly in place. If thats not it then its possible that the smc is incorrect. Try building a new image.
It's been a minute since I've done a JTAG but I'm pretty sure SMC would just lead to a e74 or e79 error some where along them lines. I've had the same issue he's having with the blinking red light. Something is shorting some where
Take pictures of your install and post or upload them some where so we can see what you have going on. Also whats the MB type.