If someone else modded it for you there are a few possibilities ...
- There is no chip installed at all, but the one who modded your xbox did a softmod without telling you.
Reason : a chipped box should boot backed up games / auto-installer discs.
If you're 100% sure a chip was installed:
* The chip shifted out of place (if it's a solderless one), one of the wires came loose or the chip died.
* The chip is turned off. Look for switches somewhere on your xbox.
Better open up your xbox and check if there's a chip at all ... it needs to be fixed/replaced anyway.
If there's no chip .... contact your modder and tell him he ripped you off.
Thanks for the tip... It appears you're correct... I've opened up my XBOX and low and behold, no MOD chip! I was quite certain that I had been explicitly told by my modder (because I asked) which chip he was using, and luckily I've still got his email as proof:
Cost is $50 installed for the latest Aladdin Live.
So I'm pretty ticked off that I apparently just got a softmod instead! I've given this guy a bunch of referrals too! Well I'll get in touch with him and hopefully he do it right this time!