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I know it's an older post, but you still may be waiting an answer:
What is probably happening is Your power board is failing to maintain power enough to run the bulbs and the rest.
That is why it takes long to start up and why it goes into sleep mode.
Does the power button stay lit (getting signal) or turn to amber (sleep mode) or does it flash.
Sounds like either a loose connection or a short in the cable going from the monitor to your computer. Try disconnecting the monitor from the computer, and plugging it back in again. If this doesn't resolve the issue, try bending the cable in different places. If this causes the monitor to correct itself, even just for a little bit, it is a bad cable. You can take it off from the monitor and the computer, take it to a store that sells cables, and get a new one.
i just had this problem with my screen (proview pl716s) if you open the case and take out the power board, there are 6 470 uf capasitors bundled together and 1 220uf capasitor replace all 7 and that should fix your problem , that is what i did and it worked like a charm , oh and btw make sure before you swap your monitor from an older standard monitor to the lcd make sure the resolution is high enough becuase if it is not then the monitor will not be able to be displayd , hope that helps