When frustration builds up I have learned to leave a project alone. You might end up throwing the project out of the window. On the up-side this may be a learning opportunity. On page 139 of Make:Electronics is an explanation how to trace faults in a circuit. I had no need for that until now. It is also an opportunity to use the minigrabber (see Figure 3-6 of the book) that I had recently bought.
Inside of the finished project box. On the lid two leds, switch, loudspeaker and banana plugs. On the left side the connector for the power.
Exterior of the finished project box
The minigrabbers. Hopefully they will be helpful to find the fault in the circuit