xbox shuts down after 15 min

[disturber]

I have to switch the power off ,pulling the mains plug.
To turn on the xbox , i have to plug the mains back.
The power switch doesn't react at all.
He feels allright and i don't think it's broken or something.
When i power on with the mains plug, everything works accept the power button

[Quall999]

Well, i don't think there is too much you can do. With those symptons, it is probably either a malfunctioning eject/power board or the power supply. The only way to know for sure is by swaping them with another two and see if your xbox does the same thing.

This problem is unheard of to me

[disturber]

The switch is working perfect because I measured it .
It's a big problem because no one has heard about such matter.
Maybe it's a mobo thing.