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You mentioned that you get no picture but that the bulb is bright. Are you saying that the bulb is always on but you still have no picture or does the bulb turn on only sometimes ?
If your ballast has never been replaced more likely that's gonna be your problem. The thing is that with time the ballast no longer puts out the voltage the lamp needs to ignite and or to remain lit. Just cause there is no flicker doesn't mean the ballast is good. The ballast actually is the second most common part to fail so if it hasn't been replaced before it's more likely time to do it.