The problem with your dome light, sunroof etc is that the upper electronic module lost initilization. I read somewhere that there were specific circumstances that caused this anomaly but I don't remember what they were. Locking and unlocking the car with key or remote re-initializes the system. As for the clunk, this is a known problem with the telescopeing steering column. Volvo just released a service bulletin detailing removing the lower steering column section and applying a special lubricant to the splines on the shaft. See your dealer.