@padmanabhan what power output is ok. You need to tell us what you have checked since this is a bit confusing. If you have power to the monitor but the power LED doesn't light up, the issue is a bad power board. You will have to disassemble your monitor and take a look at the power board etc. Check for any damaged looking component etc. you can always take some well-focused pictures and post those with your question. that way we can see what you see.
Use this guide [guide|169074] to get to the boards.
[guide|21499]