When monitor goes to sleep, the power lights flash oddly ... purple and blue, in two different rhythms. At that time, monitor's on/off switch doesn't respond. (On/off switch DOES respond when monitor is working (solid blue light) or in power save (yellow light). When lights are flashing, monitor also does not come back on when mouse is wiggled and keys hit.
If I attempt a hard boot (did it just once) the monitor came back.
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I disagree with ikkenom only due to the symptom of the flashing blue light. This would indicate to me that the monitor is not getting any display signal and is in sleep mode at least the is what happens on my Samsung monitor. Used to be that they use a two color led in the monitor, green when ON and getting display signal and amber or orange when in sleep mode. I would check the computer by trying a different monitor. If you have a second monitor, great, if not, maybe a friend will let you bring your computer over and try the computer with their monitor. Could also be a display adapter setting. Do you get any change when you first turn on your computer? i.e. Do you get the BIOS or manufacturer screen when first turned on? Also if you disconnect the monitor cable from the computer and power cycle the monitor, do you get a No Signal display for a few seconds before the monitor goes black and the blue light starts flashing?
Let me know what happens with the testing above or if you need further instructions to carry out testing.
That is actually not power saving mode, the flashing power light indicates the power supply is not starting up correctly and keeps shutting down and trying again. This is a very common symptom of a failure of the capacitors on the power supply board. The L1752s uses the AIP0157 power supply board which is the same board the is used in several LG monitors such as the L196WTQ and L194WT. Here is a link to a repair guide for the L196WTQ that shows what capacitors to look for and replace on the power supply board to bring the unit back to life.
The most common problem with the L194WT monitors is a failure of the power supply board. There are parts called capacitors that fail and can cause the issue you have. Sometimes the power light will just flash, sometimes it takes several minutes to display a picture or even a wavy picture, all of these issues indicate a failing power supply board. These boards can be repaired if you can do a little soldering. The L194WT uses the same power board as the L196WTQ and we have a step by step repair guide with dis-assembly instructions available at http://www.ccl-la.com/blog/index.php/lg-l196wtq-bf-lcd-monitor-repair/ Look over the guide and check your board to see if your capacitors have bulged and need to be replaced.
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i get a similar thing, i accidently entered sleep mode then turned off my computer at the power button on the back, now i turn on my monitor( i dont get blue flasjhing but it jsut goes on and it doesnt register, then says going into power saving mode and the colour on the button turns yellow its very frustrating :(