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First--was it working? Did it suddenly stop? When you see the LG logo, then it goes away, does the power light turn from green to amber? Sounds like that doesn't happen. So--if you are getting a signal, you should see something. If there is no signal, then the power light should change from green to orange. With no lights at all, I suspect a faulty monitor.
The power light is flashing green can indicate start/restart of the power supply due to shorts circuits or failing power supply due to bad caps, look for bad caps with bulging top first, see example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Post back what you see insdie so we can guide you furhter.
We have a dis-assebly and repair guide posted on our web site at: www.ccl-la.com/monitor_repair.htm The problem is usually the driver transistors, our guide shows where they are and what to replace to get your monitor back running again.
I had the same problem. power led would flash green for a few minutes then the monitor might come to live. the problem was multiple bad G-LUXON capacitors on the power supply board and inverter. the monitor is full of them. just search online for bad caps and they are near the top of the list. replaced them and it came back to life.
ok, get to the event where you get this to happen "...then turn it back on the monitor does come on normally...", but just after power-up, press the F8 key to go to safe mode. If nothing visible, press ENTER anyway...get to safe mode yet?