Red Light on Plug in connecter thing

Sounds like there is something wrong with the Xbox 360 power supply, try unplugging the Xbox 360 power supply from the console and unplug the power cord from the wall outlet also unplug the Xbox 360 power supply from the power cord. Give it a minute then reconnect it all back, also try it on another wall outlet without any extension cord at all.

If it's still red that suggests fault with your Xbox 360 power supply so will need to contact Xbox 360 customer support if its under warranty they should be able to sort it out for you. If out of warranty it might cost you for a new power supply!