"If the 8300HD is in 480i the HDMI interface will not output a signal"
"To get to 480p 720p 720i 1080i turn the power off then hold down info and guide at the same time then follow the promps for setting up the advanced settings it will step you through the various screen formats and to can accept them or block them. I found that the output from the HDMI was not a crisp as I would have liked as I was seing quite a bit of compression noise specifically in the blacks.
Also if you forget to remove 480i from the list of available screen modes and you go to the picture setup menu and choose auto by accident you better be ready to hook up the component outputs again as auto on my box went back to 480i again. I must say that even comcast was not all that knowledgable about this box."
"480i problem. Arrrgh --- it looks like I just ran into the 480i problem. I mistakenly approved 480i output, and my box is connected only by HDMI to my Samsung HDTV. Now I can't see the damn TV, and even though I hit info/guide on the cablebox to try to fix it, I think the **menu itself** is now outputting at 480i, so I can't even see the @#$$# menu to fix it?!!? HAs anyone run into this problem? Is there a way to hard-reset the cable box so that when it starts back up, it's at least outputting at 480p (which I assume my TV will show?) Otherwise, it appears I'll have to temporarily put in component cables from the box to the TV, fix the menu, and then remove the component cables. "
http://www.scientificatlanta.com/ExplorerClubGuides/getting_started/4003870.pdf
"Adding an external hard drive to boost the capacity of the 8300HD is easy.
I purchased a 250GB SATA hard drive and external SATA enclosure from
www.zipzoomfly.com for about $135. Then, I purchased a SATA to eSATA cable from
www.satacables.com for $20. I installed the hard drive into the enclosure, and connected the SATA end of the cable to the enclosure and the eSATA end of the cable to the 8300HD. I rebooted the 8300HD, and it recognized and formatted the hard drive. Now I can record 50 hours of HD material on the 8300HD. Awesome!!!!!"