Taken from xboxhacker.net:

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after modding many many x-boxes I want to confirm it's true there is a new version that came out during 8/2002
different things: re done mainboard, no fan on the nvidia video chip, small chip missing behind the onboard bios.
different connection for the control leads inside.small board is now missing that the control leads plugged into.NEW DVD ROM USED PHILLIPS BRAND, not as loud as the Thompson but still whats the point without a mod chip.
all mod chips I tried wont work. I will put some pics here tomorrow.with the new bios number as well ! !
If you fit the evox mod chip the machine wont power up, it's just keeps flashing, on/off no screen, no nothing.
Hope this is'nt a major setback in the mod chip world.
Seems all new AUSTRALIAN models are like this now.

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Interesting stuff