I have Slingbox m1 connected to comcast cable box. When my tv is on, I get 1080i reception via sling. But when I turn on the slingbox remotely, I only get 480i as the tv also doesn't turn on. So it appears my cable box only flips to 1080i when the tv is also on. Any ideas how to stream in 1080i even when tv isn't on, or how to also turn on tv AND my cable box so I can always get 1080i?