I have built a simple multivibrator circuit using IRF530s for the switchers. It does not start unless I introduce noise by touching one of the timing caps. I tried to include a circuit image but as a new user could not. It is a textbook multivibrator only using power MOSFET instead of Bipolar Transistors. How can I make this circuit start at power up?
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Instead of applying a static 20 V power supply or a slow start PSU, pick a voltage source that starts instantaneously. When simulating, pick a step voltage source that is 0V for the first second, then after 1 second make it step to 20 volt. This step introduces enough noise in the circuit to make it start.