problem solved: how to play orignal disc with modchiped 360.
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the modchip & 360 runs well.
what i did was
1. insert the original disc first, 360 will play and read the disc but once the 360 says "to play this disc, put it in an xbox360 console" [bla bla bla, something like that].
2. back to the dashboard, press and hold the controller's grey xbox globe in the middle for about 3 seconds, the shut down tab of 360 will be appear, choose "shut down console"
[leave the original disc inside the disc tray]
3. after the console shut down, about 3-5 seconds later, press and hold again the controller's grey xbox globle for about 3 seconds, the 360 turns on, the disc will be spinning, it plays & reads the disc and 360 runs the orginal game disc - enjoy the game !
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after played the original disc about 30 minutes, i inserted back the copied game, it runs well.
back to the dasboard, inserted the original back, and yup...it still runs well
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im not sure what was happened to the 360 and modchip, the text "to play this disc, put it in an xbox360 console" [bla bla bla, something like that] wasnt appear anymore when insert the orginal game
the original disc is DOA4 Asia religion
bought 360 in jakarta, Indonesia Rp4.000.000 [+/- $400 USD], modchip installed, 10 backup games, one original [DOA4]
thanks guys