That looks like a current sense resistor, with two big terminals and 2 smaller ones. Could be a fuse, as poster above says.
Check diode above it, D248 and the IC on the left could be dead, q148
desolder resistor, check fuses and see if switch starts.
if not see if that q148 is dead or shorted, causing protections to kick in and shut down the switch.
maybe see if ic gets more hot (if shorted that happens) or see if switch starts if you desolder IC.