Hey Harold. Man and blenders can be tricky when they stop working, happened to mine last year and I figured it out step by step. First off, unplug it and take a close look inside the jar area for any bits of food stuck that could be jamming the blade. Spin it manually if you can, carefully though. Then I disassembled the base a bit, not too much, enough to see if wires were disconnected.
Turned out a switch was dirty so I cleaned it with a q-tip and some rubbing alcohol, put it back together and bam, it powered on. If yours has a fuse, that might be blown too, but testing with a multimeter helped me confirm. Yeah, saved me from tossing it out.
A timed hot water line warmed the wall and sent a slow heat plume past the PIR that looked like motion. Facing it toward a cooler wall and blocking the warm side with a small baffle or opaque tape stopped the false triggers.
