Ok dont know if this is usually but when i reboot in mxm i hear a loud clicking sound when i reboot and the xbox turns off the on is this usual?

I have that click too. I've always had it though, since it was new. I think it's normal. Maybe power supply turning off or something. It has nothing to do with MXM.

It maybe a result of the fact that MXM is possibly accessing the disc playing a video or music, for example) when shutting down.

Those clicking noises where your hdd´s last´s breath bro. Your xbox is dieing i recomend hot swaping before the worst happens

WTF you decided to answer a year old topic and ben had the correct answer anyway,your attempt to sound knowledgeable has failed.