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1. Mostly Loose contacts in video section that means CRT Neck board dry points checke it.
2.Pl check VGA Cable RGB signal pins 123 to ground 75 Ohms (on OK condition).
3.check 5v supply
4.check SDL and SCL signals.
1. if your monitor is old. due to aging it happens normally 2. Check monitor signal cable 3. Else the colour processing circuit is defective. 4. Check whether your monitor settings are set correct(default) 5. Contact monitor service centre for further rectification
in Monitor CRT Red-Blue-green cathode guns are there.. Mixing of these colour we can get the original colour chrominace technique. if any of the colour gun is faulty we would get more REad or blue or green picture. Measure RGB voltages. you can verfify which gun is faulty. if then check RGB processing circuits. Else there might be problem Chrominance colour decoder system. Contact service centre
your problem is in blue color cathode circuit.
as you say that it becomes ok tha5t means
1 cable wire is loose from computer to monitor.
2 crt base loose.
3 loose contact in blue video ckt.
4 signal processor cable to crt board connector loose.(blue wire)