One of my modded gridseeds quit yesterday. There's no real obvious signs of a short or any damage.
The fan doesn't spin.  When I plug in 12v the fan moves a fraction.  USB seems to work.
If I plug this gridseed into the psu with all the other gridseeds the psu shuts off.

Would a failed mofset cause symptoms like this?  I ask because there is a very small bump on the top of one of the mofsets.

Any ideas?
Are there any tests I can do?