First question - did it ever work?
I've not heard the very quiet squeal, but it is possible that what you are hearing is the inverter circuit that generates the high voltage for the spark igniter. This makes a high-pitched note as it operates, which is perfectly normal.
I agree with both previous suggestions. Make sure that gas is reaching the burner (I think you should be able to smell it from outside), and look for a spark in low light.
Meanwhile check your owner's manual for the water heater. It is in your blue binder, or you can get it online. It tells you, with pictures, how the spark electrode should be positioned with respect to the burner. If the spark is not hitting the gas stream, it will never light until you reposition it.
Bill
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