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Usually it is bad power supply problem or bad channel problem. Look for any burned parts, it helps you locate the problem. Burnt resistors in one channel- you need to replace output transistors (better to replace all transistors in that channel) and bunch other surrounding parts. If you do not see any burned parts, check all voltages coming from power supply +15 -15 +5 etc then check dc at every channel output (not at speaker terminals but at control pins on the amp/main pcb), should be +-10mV
does the unit have a setup menu button on the front panel? if so push that, watch the display, use the up, down, left, right, select buttons on the panel to navi the menu. go online and look at a pdf user manual for the unit
More than likely audio o/p problem.could be speaker problem,dissconnect speakers and try to power on if still no go it is job for technician.If it works one of your speakers has a short on it,good luck
is the square button also labled as down arrow button, push the down arrow button and will give access to the lcd screen setup options on the receiver center speaker size lfe att settings cross over rear channel size ect. i don't have the manual either took me a year to fix the issue.