The power supply on lcd and other flat screen type monitors utilize a group of capacitors as a static pulse for the screen to energize..my bet is that one or more of those have failed...it's actually a common problem with flat screens. Most of them, those that won't power up anyways, have this exact same problem. If it's not that, then your power supply is burnt out, and if that's the case it may be cheaper to get a new monitor instead of trying to fix the old one.
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