As I said in my first post to this thread, you might as well keep trying/flashing firmwares, but you claimed to have already done a lot of that. What you're describing is symptomatic of the NAND being corrupted. It's too time consuming for service centres to replace just the NAND (removing/re-soldering components like that is fiddly), so they simply replace the whole board (and charge you a lot to do it).
OK...That extra information you supplied in your last post might give you an easier/cheaper fix. What you've just described sounds a lot like the USB board/port is on its way out. Replacing this yourself is cheap & easy to do (you just have to wait for the part to be delivered once you order it online); there's a guide in the General section which has all the info you need (search for replace USB charger board). Do that, then see if you can get a successful Odin flash. If you can, happy days. If you can't, then you replace the motherboard one way or another (or get a new phone).
This may or may not fix your problem; it may be a case of the NAND corrupted and
the USB board needing replacing, but you're only going to know if you replace the board first.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Probably the best thread ever posted on XDA
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?