Instant Red Ring of Death on startup. No video output.

This is a broad GPU failure code. The primary cause is cracked/fractured BGA solder joints underneath the Graphics Processing Unit (GPU) due to severe thermal cycling. Less commonly, this indicates a completely dead GPU die or a bridged connection under the chip.

Console boots up, shows a green light for roughly 15-30 seconds, and then drops into the Red Ring of Death. No video output.

A highly complex error indicating the CPU cannot communicate with the GPU or NAND. Common causes include fractured BGA joints on the CPU or GPU, a failing GPU PLL line, or a corrupted NAND flash memory chip resulting from a failed dashboard update.

The "Classic" Red Ring of Death (3 red lights). Video may artifact (show strange lines/colors) before dying completely.

The most infamous error of the Xenon/Zephyr motherboard revisions. The thermal stress of heating and cooling has caused the lead-free solder balls connecting the GPU to the motherboard to crack. The connection is physically broken.

Console shows 3 red lights, or occasionally boots but freezes instantly with checkerboard patterns on the screen.

Cold solder joints underneath one of the GDDR3 RAM chips. The memory modules surrounding the GPU undergo the same intense thermal stress, causing the solder balls underneath the memory chips to fracture and lose contact.

Screen displays "System Error. Contact Xbox Customer Support" with the code E74. Only 1 red light flashes on the console.

A failure in the AV/Video line. This is almost exclusively caused by cracked BGA solder joints beneath the HANA or ANA scaler chip. If the HANA chip is intact, it indicates a fractured connection on the GPU's eDRAM line.

Screen displays an E73 error with 1 red light flashing. Console fails to initialize the network interface.

Cold solder joint or complete failure of the Ethernet PHY chip located near the Southbridge. Occasionally caused by a lightning strike or power surge through the ethernet cable frying the network controller.

Screen displays an E68 error with 1 red light. Removing the hard drive often allows the console to boot normally.

A mechanical failure of the Hard Disk Drive (HDD) or a severe power draw issue. The HDD motor has seized or the SATA controller has failed. Rarely, it indicates failing capacitors near the Southbridge causing voltage drops.

No red lights. Console boots fine. You insert a game, hear the drive try to spin, but the dashboard simply says "Open Tray" or "Unrecognized Disc."

The internal DVD drive laser lens has burned out or become opaque over 15+ years of use. Alternatively, the rubber eject belt has stretched, preventing the magnetic spindle from fully clamping the disc to the motor.