i think it's time for an upgrade.
if it holds special sentimental value to you, or you use it for some dedicated task (i've seen them as recipe stations in kitchens, etc), it should be very easy to repair. opening it is the most difficult part, you need an extra long torx wrench, i think #8. there's a kit called a mac cracker that includes this and a part to pry the shell apart. be VERY careful of the capacitor on the back of the monitor, it can make you very dead very quickly if you touch it. anyhoo, you could buy parts or even a fully functional SE on ebay, then start swapping things out. but then you might as well use the functional SE, again unless there's sentimental value.
pnw