Here’s a recommondation from Microsoft which is a fiarly basic fix. If it doesn’t work, check out our other articles on the bottom of the page:
Xbox 3 Red lights flashing
The three flashing red lights is the classic indicator that you have a serious problem regarding the hardware on your Xbox 360.
Step 1: Check the light on your power supply
The power supply light is in the middle of your power cord’s black box on the back of the unit.
Figure 2: The Xbox 360 Power Supply light
Option 1: If power supply light is green, you have a serious error:
Figure 3: Three flashing lights on the Ring of Light with a green power supply light
Your console needs professional repair. Read our suggestions at the bottom of the page for options on repair.
Option 2: If the power supply light is orange when the console is powered on, isn’t lit, or is red, try the below tricks
Figure 4: Three flashing lights on the Ring of Light with a red, orange, or unlit power supply light
Solution 1:
Unplug your game console and try plugging the Xbox into a different outlet in a different outlet or a different room in your house. If it remains the same you need a new supply, if not, you have a bad outlet in that room.
Solution 2:
If the power supply light is still red, orange, or not lit, then you will need to get a replacement power supply.
