Sorry I tried searching, but coiuldn't find an answer. I have a THD (Series 3?) and sometime over the weekend It stopped recording (wasn't home). Green LED was on, but blank/gray screen on TV, no responce from remote. So I unplug, replug, Get powering Up screen, then gray screen, Try it again, and it booted! Whew! Then wouldn't you know it, the power in the house goes out. 2 hrs later it comes on, and now gray screen after Powering up, no matter how many times I try. Luckily I have another THD I canceled a few months ago, so I just swapped them out, but need to know what the problem is because I'm sure it won't be long for the 2nd one to die, bought them at the same time. So how do I tell if it's the HD or the PS? I tried the pause 5-4 diag tricks, but only the green led lights up, can't start the diag. Can I simply swap the HD's from 1 THD to another? That would be great so I could save the programs that are on there, with all my season passes, etc. I don't see any popped out caps on the PS. But the Network lights are both solid. It sounds like the HD is spinning. If it's a HD, it seems easy to follow the steps I found to download MFS and make a new drive. It seems Any THD drive can be used to make new drives. I don't have cable/cable cards only antenna, componet output, and used composite too, no HDMI. Suggestions? TIA!