Rossi, In addition to people resolving this problem by replacing the power gasket, some (including me) have resolved it simply by moving other electronic equipment further away from the Cube. In my case, at home, it was my DSL modem. Where I work, it was walkie talkies interfering and causing the Cubes to go to sleep or shut down. If you have an ADC monitor, the monitor and cable can also be sensitive to interference from other equipment. - Mike >My cube keeps shutting down or puts itself to sleep.. I have tried >relocating the DC-DC board as the Apple website suggests. No luck. I >remember that someone here said it might be an oversensitive capacitive >discharge switch on the cube and that there was a thicker gasket!? >available from Apple. Apple UK deny all. Strange that!! Also I >remember someone saying that a piece of sellotape placed crucially >might do the job. I noticed that the switch electronics are only >connected to the main gubbins by a 3 pin plug. Has anyone tried >disconnecting that ( no glowing switch - but hey!) and using the on/off >on the Apple LCD. > >All help appreciated > > >Cheers > >Rossi