XBOX 360 ERROR CODES
Onscreen Numbered Codes:
67: Hard Drive Error - It could be a problem with the Hard Drive itself or a problem with the internal connection to the hard drive, Try removing the hard drive and playing without it
74: AV cable Error - There is a problem with the AV cable, try using a different AV cable.
LED Codes on the front:
If Sections 1, 2, 3, 4 is Red and Flashing - The AV cable is unplugged... plug it back in.
If Sections 1, 3, 4 is Red and Flashing - This is a General Hardware Error, typically caused by the Hard Drive, Try removing and re-attaching your hard drive, else try removing your hard drive all together
If Sections 1, 2, 3 is Red and Flashing - 4 are not lit up at all. -Microsoft suggests reseating all plugs into the 360 and then powering on again. Microsoft also suggests unplugging your HDD and trying to turn on the 360 again. If neither of these two works it is a bad power brick and Microsoft will require you to ship all 3 pieces into them to get it fixed. You will lose all your data on your HDD so buying a memory card is a must even for a premium owner.
If Sections 3, 4 is Red and Flashing - Console over heating, shut it off and let it cool down, ensure there is plenty of air flow.
If Section 4 is Red and Flashing - General Error, see error code on screen