The -15v reg could be defective. If you have a 1 ohm resistor, connect it between the 3rd leg of the regulator and the board. Connect a meter directly across the 1 ohm resistor. If the voltage across the resistor never gets near 1v, the regulator is very likely defective. If the voltage across the 1 ohm resistor is 1v or more, the current draw from the regulator could be shutting it down.
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