Unable to boot - Stock firmware

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http://forum.xda-developers.com – Hey guys, I decided to start my phone with a clean slate and un-root it via installing the stock firmware I9300TDUALF2_I9300TVAUALF2_VAU I've done this before and it's never been a problem, but now my phone will not start up properly. It gets to the Samsung flashing logo in the boot animation and just stays there forever (literally). I tried 2 (from sammobile & androidromupdate) other different Australian firmwares and still the same thing. I've flashed CF-Root on the phone, booted up into recovery and installed a few different custom ROMs but the same problem occurs, it just stays put (HowTos)