The first power supply may not be so lucky, because had not yet normalized leakage electrolytic capacitor. It should be 10-15 minutes of work that they have recovered oxide layer are included in normal operating mode. The point is that under long-term storage oxide layer slowly dissolves in the electrolyte, and it takes time for his recovery.

Tip: Typically, these capacitors capacity is not always enough. As a result, block, sufficient power is still not pulling... It's easy to correct. Just solder the wire directly to +12 volts (yellow wire) and the mass of the condenser capacity 1000mk at 16volt.