Am 03/10/2011 11:04 AM, schrieb Simon Matter: > - Take a vacuum cleaner and *carefully* clean the whole box. Dust can > really do bad things because it is not a perfect insulator. Never ever do that. Especially not inside the machine. There is a real risk of simply vacuuming smaller components like smd-resistors of the board. And, as already mentioned, you also have the chance of killing components by electrostatic discharge. Always use compressed air, even if just using canned one. Vacuuming is a pretty bad advice.