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It's possibe your ballast is no longer putting out the voltage the lamp needs to ignite or remain lit. This is the component that power the lamp. These components are consumable so eventually they will need replacing. Keep in mind a weak ballast can power a old lamp but not a new one thats because a new lamp requires more power than an old one. The ballast is also the second most common part to fail apart from the bulb. I'm sorry I cant guarantee you this is your problem but it is a good possibility.