After months of freezing and locking up, my 6 month old hr44 genie booted to an error screen a week ago. Second reboot showed the same thing so DirecTv sent a replacement. Meanwhile the old one started working again (but still freezing a lot) and we were able to watch what we wanted to and make a note of our series recordings, etc. I am packing up the old one tomorrow, but have two questions: My old genie was an hr44-700 and the new one is hr44-500. Does it matter if I just swap out the box and not the power cord? I'm tempted to keep both to have a backup, but instructions say to include power cord. Any significant differences in the two models that I should know about? thanks!