My advice: Unless you have some serious know-how, forget all about it. You'll end up spending more money than gaining any by having someone else fix em. And fixing yourself? Sorry but CRTs are a BITCH to even disassemble and reassemble, let alone fixing anything. Sell em at a yardsale, as-is, or give em to goodwill or something.
Core i7 920 @ 3.8Ghz | 6GB OCZ DDR3 8-8-8-24 @ 1600mhz | eVga x58 Mobo | 2 x eVga GTX 460 SLI | Intel X25-M + 3x Seagate + WD Black = 2.75TB | X-Fi Titanium | PCP&C Silencer 750 | G15 KB | G5 Mouse | G35 Headset | Z-5500 Digital | Samsung T260HD