CAR WONT TURNOVER AND START - 1997 Land Rover Range Rover

replace the starter motor?
they wear out and give aforementioned symptoms .

Should have a gauge or 'idiot light' that warns you that they system is not charging, other than that your lights would been dim.

yes it could very well keep it from starting get that fixed first

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99% probably it is the starter.

Need to know the year make and model of the vehicle.

sounds like fuel pump

start by troubleshoot the alternator, your Car Battery and, Starter. It has to be one of the tree, it could also be the terminal wires connected to one of the three components.

what do you mean "wont start" do you mean it turns over and wont start, or wont turn over?? belts dont just break, if the car wont turnover, take the belt off and manually spin every pulley with your hand, all should spin freely (except the large bottom crank pulley) you may find that one of them is siezed.

It sounds like the timing belt snaps based on the hissing sound that you described............if it cranks lightly without much load then it is confirmed the timing belt has snapped.

ya hi there do you know motor size and year ? can you locate the ignition coil ? if so check to see 12 volts is present when you turn ignition to start position? check all fuses and also check relay's take each relay out and wiggle back in might be a bad connection .