upgrading my 120gb to 750gb on modded xbox

I just got my 750gb refurbished hdd and am using the AID to try to boot it up but for some reason it wont load as easy as all the other threads that I have read imply that it will. I try to not start threads as there are loads of info from previous encounters pertaining to my situation, but after browsing for some help i can't seem to find what I need. I attained my xbox already built with a 120gb drive, and after dissecting it I think it has the alladin chip. I am running xbmc for my dash and it has been great (aside from burning off the solder where the power meets motherboard, quick fix) but i have the urge to push my storage to the maximum an ide drive can give. My new drive is a seagate barracuda 750gb 7200 rpm. I checked on the compatibility chart before purchase and it apparently is compatible. I switched the drive over, put in the aid, and it flashes red and yellow and says the hdd is unrecognisable. I know the aid is correct because i used it before to repair my box with previous issues. I have a laptop so i cant swap my computers hdd to load on the new dash and eeprom manually. Please help with any info and advice