I have a TiVO HD (TCD652160) that seems to have an issue when booting up. Basically, it had 1 S-card cable card in it for a few months now and all worked good. It was in a basement bedroom that wasn't used much so I didn't worry about it being a single tuner DVR. I then got a hold of another S-card from Comcast and put it in this TiVo HD. It recognized it, I called Comcast and had it paired and all went well with that. It then became a 2-tuner DVR. Now, when I reboot it with these two S cable cards, it just seems to get hung up on the "Welcome, powering up" screen. However, if I take the 2nd cable card out and reboot it, it boots up just fine (as a single tuner DVR). I can then re-insert the 2nd cable card and it recognizes it again and functions fine as a 2-tuner DVR. Is this the way it normally works? Or what else could this be? My series 3 OLED doesn't seem to do this, but maybe these models do. Also, I realize I could probably just get a single M-card and use this instead, but my local Comcast office has apparently been all out of M-cards for 3 different trips I have made to it over the last 3 months. Due to possible billing issues that may get messed up with my account, I don't want to call them and have them mail me an M-card either so I am just gonna stick with these S-cards for now. So, do these Series 3 TiVo HDs sometimes work like this? Is there maybe something I am not doing correctly here? Just curious.