MacBook Pro will not power on

Light on mag power adapter is dim, you can hardly tell it's on. It was plugged in and working but when I went back to it it was off and won't power back on. There isn't any sound. I tried all the tricks, even called Apple and they gave me same fixes I already tried. A video said leave computer unplugged for several days it should turn on. Is this a battery issue or something easy to fix, or do I have to take in for repair.

Please help!!!!!

Thanks

Mary Ann