Power lite is on but nothing\r\nhappens when power

Check your Speaker control button. Most receivers have a small button on the front used to control your choice of Speaker Set A, B, A & B, or NONE. It's possible you have inadvertently pressed the button and set it to where no speaker set is selected. Therefore, no sound.
Another probable cause is that one of your speaker cables may have become dislodged at the back, and if your system has an overload control mechanism, it's preventing sound to come out to avoid damaging your output transistors, your speaker system, or both.
The last (I hope not) possibility is that the volume may have been cranked up too high, that either the output resistors may have blown on your receiver, or your speakers may have given out the ghost due to too high a signal.
Good luck!