Crackling implies a bad connection. If it crackles at the PSU connection, then visually inspect the connectors. If they are not the normal color, then replace the power cord and the PSU if it also is discolored (usually brownish caused by sparks).
actually it crackles at a point in the wire
By that I mean, If it is crackling, If I just move the wire left or right and I can stop the crackles