I have a Hughs SD-DVR40 unit that years ago I added a 120gb drive to. This weekend the unit seems to have cooked itself and locks up or crashes on boot-up. I assume I will have to replace at least one of the hard drives. My question is, is there an easy way to tell which of the two hard drives (the original with the OS on it I assume, or the 120GB I added) is dead. If the original I assume purchasing a new formated HD from Weaknees is the best route to go, but if the 120GB newer drive, should I be able to just swap that out and all is well? I am guessing its the original since I can't seem to even get to the programs list screen, but I wanted to check with people in the know.

Thanks,
Matt