Stating the obvious or restating here but when you test drive a car always do about 30 Km/h and swerve hard like full lock and see if the CV's make noise and shit.. My dad knows a heap about cars and stuff (truck driver) and I've been with him to repair alot of things. Does the pump make any noise when you turn the wheels full lock? Maybe air/blockage. If the starter motor just goes t-t-t-t-t-t-t-t means you're battery is flat or the starter motor is fucked. If putting you're foot flat to the boards when you try to turn it over just means that the motor is starved.. Some older cars have that problem