Very dark iMac G3 screen?

i opened summer 2001 imac g3, , did little bit of dusting on inside. quite bit of dust , little pieces of junk fell out, did not thing broke off of computer. think stuff fell in when previous owner opened computer. when put , powered on, dismayed see how dark screen had become. quite hard see anything. brightness way up, , turned , down sure. shut down powered up, no avail. have damaged in computer? can fix this? thanks!

 

that's sign of failing flyback transformer. did open crt half of imac or computer half?

 

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