Why wont my dremel turn on?? - Dremel 400 Xpr Rotary Tool

1st ck to see that outlet has power on it by using a known good light (drop lights work great for this) next if tool is plugged into a foot pedal or speed control remove this and connect direct to outlet , activate switch on tool see if it runs

if not you most likely have a dammged brush on tool <this is very common i usually go thru two sets a year , brushes are available for dremels where ever dremel brand bits and tools are sold ck on back of package for your model number

if doing a lot of sanding or grinding allways make a habbit of blowing out air vents on tool body with a strong source of compressed air (canned air ok) this helps keep it going for years