I plugged in a usb cord, my macbook pro switched off itself, it was then connected to the adapter.After that the adapter also gives dim green light( not the usual one, but dimmer).Since then macbook has not switched on.No light , no fan noise.Please help.Have tried ctrl+command+power button , but no help.

Try using a different power adapter and start up again. When you press the power button did you hear any sound or there is totally nothing not even a single word on the screen as well?

may be your power cord is not working properly, try other cords

Take out the battery, disconnect the power cord and press the power button for 10 seconds.
Then, leave the battery out and connect the power cord, see if it powers on.

Change your adapter then see what happens

I am a new member and I don't know how I can participate in this discussion. Will you somebody help me to start?

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.