I have two Hughes SD-DVR40 DirecTivo units and one is having problems. It constantly reboots itself or freezes. When frozen I have to unplug the unit and plug it back in. I'm thinking that my options are: 1) Ask DirecTv for a replacement and use their proprietary DVR 2) Replace the hard drive (purchased from WeaKnees?) 3) Buy a used DirecTivo online 4) Send my unit to WeaKnees for repair. What are the pros and cons of each? If I buy a used unit online how do I get DirecTv to activate it? I am not savvy/adventurous enough to buy a generic hard drive and load the appropriate software onto it. WeaKnees wants $130 for the cheapest hard drive replacement - their instructions for installations look ominous but I can give it a try.