I have an Integra DTR 5.1 receiver which worked great until the warranty expired. Then the unit began to not produce sound. The display works as normal and I can see the system respond to signal input and the change of that signal. For instance, I have an optical connection to my computer and can pump stereo, Pro Logic, or DTS to the receiver. Power supply gets hot as expected but the transistors' heat sink gets just a bit warm. I put a multimeter to the speaker posts and get absolutely no power coming out. I find it hard to believe that ALL my transistors have died, so could someone point me in the right direction to a fix?