It most likely needs a new flyback if it's snapping. It will also help if you identify it beyond a "k7000".. that actually does not exist. It's probably a u2000,u5000, k74XX, or k75XX if it's a 25 inch.
This post will help you identify exactly what you're working with so you know what monitor you're working on and what flyback to order:
http://forums.arcade-museum.com/archive/index.php/t-267353.html
Keep in mind that beyond a cap kit and flyback, you could have a bad tube. From my experience, it's worth shotgunning a cap kit and flyback for $40 to see where you're at with it.