My BigBox had stopped in the middle of a few prints. I thought the power supply was glitching and ordered a new one in case that was the cause. A couple nights ago it stopped in the middle of a print but this time there was no power. Flipped the power switch a couple times and no sign of power. Okay I thought, the PSU finally died. Good thing I bought a new one! When I had some time later, I took the bottom off and replaced the PSU. I put the bottom back on and flipped the switch - NOTHING - No power. I pulled the fuse and checked it. The fuse was fine Okay take the bottom off. Again. A little troubleshooting with a meter and I conclude the switch has failed open. I dismount the switch and what do we see? Melted plastic next to the terminal on the left. If you look carefully you can see the copper wire that slots into the terminal blade is a bit burned and the tinning is gone from it. So, on the bright side, it didn't set the house on fire.