Blue light turns on and off then doesn't work

When connected to the cable, a blue light comes on and then disappears and nothing works. I checked the fan and found that it is rotating and working. I do not know what the problem is.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0