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I know some people still prefer old CRT monitors over more modern LCD monitors even today. Unfortunately Cathode Ray Tubes or CRTs aren't serviceable since they are a factory vacuum sealed unit and this probably why no-one has replied. The black dot is probably a burn mark on the inside of the CRT if it's always there. When there's a problem with the CRT itself there's nothing one can do except replace the unit and it's not worth changing the tube as it will cost much more than the monitor is worth and anyway I'd be very surprised if they even bother making these old parts any more. One can buy 17" CRT monitors as cheap as 10 pounds and larger CRT monitors for a bit more at recycling businesses like Speedie Computers near Birmingham in the UK, so if you you still want to use an old CRT monitor, replacing the whole unit is certainly the best option. There's currently still an excess of old CRT monitors that need recycling after being replaced by newer LCD monitors and recycling companies like Speedie often have literally pallet loads piled up high and they'll be only too glad to let you take one or more off their hands for next to nothing. It's better if you can find somewhere local to yourself rather than purchasing online if at all possible or you'll probably end up paying more in postage than the cost of a replacement used CRT monitor because they're fragile, heavy and bulky to transport.
Sounds as if your monitor's board is burnt out. I think its time for you to invest in a new one. You can recycle your old monitor for parts. Donate it to an E-Waste recyclers because you don't want that lead in the landfills.