Did you drop your drive on the floor while you were installing your chip?
If your drive won't read originals you have a couple options: you can try the pot tweak
procedure to try to increase to sensitivity of the laser to read your media, or you can buy a whole new drive from a place such as llama.com
. There is nothing to installing a new xbox dvd drive, it's just a matter of taking the old one out, and plugging the new one in (without dropping it
EDIT: Sheez, $150 for a Samsung drive?? It'd be cheaper to buy a new xbox, take the dvd drive out, put the broken one in then sell it for $50 bucks to llama.com as a broken xbox.