Help!! Don't have Dvd-key and was wondering if a Mod-Chip would allow game to boot up.

I all. Wondering if you can help me. I bought a system of Craigslist a while back that said all that was wrong with it was had a cd read error. See this, I bought the system, bought a new drive, then proceeded to flash it, which it took fine, but now it only reads dvds\cds and no games. All it gives me is a "Must be in a Xbox 360" error message. I've flash again and again, even made sure the key was there but no go, it still won't read games.

After looking at numerous forums with other people with an issue similar to it, I concluded that the DVD-key must be wrong and the person whom I bought the console from may have tried flashing it but flashed with the wrong firmware.

My question to all of you is since I apparently don't have the DVD-key, would buying, installing and powering an Xbox 360 with an Infectus 2 or Globe 360 modchip in it have the Xbox boot up games properly without this error? Or am I SOL and have another DVD player that I don't need.

Any help would be greatly appriciated.