computer monitor going red
Go inside the monitor but be carefull at high voltages. In the most of the cases, you have a faulty contact on the video board or in the CRT connector, resolder the components. However, in very rare cases I've encountered situations when the heater made intermitent contact with the cathode. Check with an ohmmeter between the heater and the red cathode (with the video board removed and cold CRT). In this case you can try to discharge a capacitor between the shorted terminals of the heater and the cathode. It will either remove the fault, or it will completely destroy the heater, this is some sort of a last sollution. Don't blame me if you have to throw away your CRT after this operation (if it is the case, of course).
/pisoiu