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Sorry to be the bearer of bad news but the fact is you have a very old monitor. My research tells me that it is almost 10 years old.
The obvious problem and the one most likely is that the power board inside the monitor is going. It is common in LCD monitors of this age. Do yourself a favor and junk it and replace is with a new larger better monitor. They are so much better these days and so much much cheaper.
You can get a 22 inch wide screen monitor on Walmart.com right now for $104.00 and pick it up at your local Walmart with free shipping. Not advocating Walmart necessarily just pointing out. Recycle your old monitor responsibly and pick up a new one. No matter how cheap it is it will be better than what you have now and your current monitor is not worth a technicians time.
If you don't have the money for a new one go to your local thrift shop and get a working 17 inch for $20. Good luck.
The setup cd for the monitors are no longer available since the manufacture date of these units are way way back ago. you can get the drivers and software for you monitor from the link below esupport.sony.com
Here is one thing you can do to help get to the root of your problem.
Take a flashlight and shine it on the screen once it has gone to black. If you are able to see the screen information (your desktop) then you have a back light problem.
The fact that the bulbs come on at first and then go dark tells me that it is probably not the bulbs themselves and the fact that your power led stays on tells me that it is probably not the power supply either.
The most likely cause is the power inverter board which is usually a separate board attached to the video mother board and it powers the back light bulbs.
This is not an easy fix for someone who is not familiar with LCD displays but it can be done. I did a Google search on Sony SDM-X73 (if that is your monitor) and could not find any stand out instances of complaints. I also did a eBay search and could not find anyone selling replacement boards either.
Truthfully, my solution for you would be to replace the monitor. It will probably cost you more to have someone work on the monitor and fix it than it is worth. You can find 17 inch flat panels on eBay or CraigsList for cheap these days and I just saw a brand new Acer 22" with a 3 year warranty on CompUsa.com the other day for $150.00.
You can try taking it apart if you want to but recycling it is the better option.
Under the menu options, there's Menu Lock. Switch it to "On". It worked
My menu button wasn't working, so to access the menu, I had to hold down
the arrow up button and push the arrow down button till I got to the
Menu Lock Option.
first, 68.5 khz -85hz means horizontal raster frequency of source signal is at 68.5 kilohertz and repeats vertically at 85 hertz. (hertz means "cycles per second).
the sony monitor cannot "read" the signal being sent from the pc. change the screen resolution to a lower number like 75 or 70 hertz vertical.