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sounds like your HT transformer is dying, or the tubes board is going out, it'll ususally start to turn white/grey with regular black lines, sometimes slanted and often with =more diagonal ones that are slightly dimmer, the brightness/contrast controls often do slightly odd things, maybe very bright
Its hard to say without testing, it could simply be a dry joint on the controller board, or just dying, either way it'd require someone who knows about monitors to fix it.
Sometimes you can turn up the contrast grid on the HT transformer to correct the brightness but thats inside the monitor, and monitors are extremely dangerous devices.
If it is a fault with the monitor , see if you can find a free estimate shop.
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