Bright,thin line, in the middle of the screen, then...
1.
I turn on the monitor, I hear a 'cracklin' sound
Reply: In a CRT Monitor there is a component called EHT which generates High voltage which is connected to the anode of the CRT, If there is any leakage due to moisture can cause this crackiling sound, You need to clean this high tension wire or replace the EHT ( CAUTION : BE AWARE OF HIGH VOLTAGES )
2.
The screen only shows a bright, thin line.
Reply: The vertical Drive section of the monitor is faulty.
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