QUOTE
If you simply get the message "Xbox Live not found", then check your XYZ settings. Specifically, we're looking at row Y, the third and fourth characters. If these say "C1", "C2", "C3", or "8A" (NOT A8!), then you have a hardware mismatch problem with your EEPROM. Typically, you'll also see "AFFF" or "0000" in the first half of Z as well. This most frequently arises from people modifying their EEPROM settings so that they can play PAL software on an NTSC Xbox, or vice versa.
harrytasker points out that using the Enigmah PAL-NTSC switcher can possibly restore this:
QUOTE
You do *not* need to replace your EEPROM because of a C1/C2/C3/8A error.
Now, from this, it would sound like I was messing with the EEPROM and messed up the Region or something like that. I checked this, but it's NTSC Region 1, and it has always been that. This "Xbox Live Not Found" came out of nowhere, after having Live work perfectly for a while. I haven't been changing stuff around. Can anybody help me?