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Unplug the power cable completely to turn off and then turn back on again. Check whether there are no lose parts with missing contact.
Most probably it looks like a deeply digital problem with no do it yourself solutions - bring it to the repairman, but I even doubt he would fix it.
You can also download the Aiwa NSX-990 service manual and analyze more specifically your case. Download it from here: http://www.mediafire.com/?jc0ynzoiama or from here: http://www.4shared.com/document/rQ67hcpG/Aiwa_XG-990-NSX-990-NSX-992.html (click "Download Now", not any other button).
if the receiver is on, you can press the "Eco" Button and then, you have to rotate the "Multi-Joy" in the next 3 seconds to change Eco-Mode to Off. When you selected it, you have to confirm with enter.