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Hi Barry if you just get a buzzing it will be a burner fault.
one of three things normally.
Oil Pump seized
Burner Motor seized
if you have a tester that can read farads you can check the capacitor it should be 4 I believe but its written on the side anyway.
if thats testing ok, you need to pull off the oil pump and check the spindle is turning you can also check the motor spindle from there. my guess is one of them will be faulty.