Yeah, just like he says, the vga port will only take certain inputs , i think it is 480p and above (i think it does take 1080i also) but if a 480i or lesser signal is coming through it won't work.
I bought the mitsubishi hd1ooo (love it) and it switches all that stuff automatically now, but before with the X1 I had the VGA cable and the svideo connected from my cable box. When I watched HD, i had to switch to the VGA input, if I forgot to switch to s-video to watch the regular channel, i would see the image split into 4 for a sec and then it would say "no signal"
So, go into your dvd menu while connected via svideo cable and switch it's output to 48op or highter.... you'll lose the signal thru the svid cable, switch to the vga and you should be good to go... AND the DVDs will look a lot better!!!!! Then when you are ready to double that resolution put in your order for the mitsubishi hd1000 and 9clams later you'll have it on your doorstep !!!!