Advertisements My Series 1 (Phillips PTV100) had a hard drive crash. When I first bought the unit new, I immediately pulled the original drive and upgrade it into a two drive system. I kept the original drive "just in case". Since my daughter is using this Tivo now, I decided to put the original drive back in and "marry" it to the other drive to create a slightly smaller dual drive unit. Everything went fine, Tivo booted up, etc. I entered guided setup and it makes the test call just fine. When it gets to the second call, I select a phone # and the unit reboots. I have tried about 6 of the phone numbers with the same result. I did no updates to the original drive when I pulled it. Could that be what is causing this. Doesn't sound like a bad modem given it makes the first call just fine (not to mention the modem worked fine before the hard drive died). Any ideas, this is really frustrating!!