Xbox 360 power supply has red light at start of day

This Microsoft support page lists three reasons why you might get a red light:

• There is too much current.
• The voltage is too high.
• The temperature of the power supply is too high.

You say it happens straight away so that rules out #3.

Have you tried it in a different socket?

If that still fails then you might have to go for Solution 4: Order a replacement.

If the power supply works in a different socket then you need to get your electrics checked. There might be a problem with that socket.

if you phone the xbox help line they will send you a new power brick for free, the guy on the phone said it was a problem with the power suply and nothing to do with the xbox 360 it self