Cl0ckw0rk:

Doe your tray auto-eject (following on from Nightstalker's point). If it does then you'd need the Fargo patcher and Unreal Tournament as your boot disk.

Ohterwise, and before you order DVDRX, what GS2 version are you using? It may be that you need GS2/1.3 and no other vwersion will work with the chip.

Have you contacted Modchip.com?