ok, i suppose i also forgot to mention that i do have a back up of my eeprom and all original data from the oem hardrive. also, using xboxhdm, i formatted both new and oem hdd's and copy original eeprom, etc. to newly formatted drives and still achieving same results. i don't believe the eeprom or any of the software have a role in the problem.
as far as the vid cable goes, i use the hi-def cables for the living room's un-modded xbox, and standard cables for bedroom box. i tried it on tv in the living room, but as far as i got was a wide-screen, beatiful xbox animation, followed by high definition CRAP at the top of the screen (in wide screen, of course).
a friend said he'd gimme his original 1.5 board with failed power supply (easy fuse fix), so i might do that, or, format the oem hdd, put in the xbox, put all the labels back on the bottom, and pay to have it sent to M$ for a shitty, refurbished xbox.
unfortunately, i'm too stubborn to buy product replacement from best buy for 30-40 bucks, so i'm SOL on that one
thx for everyone's help