Originally Posted by MikeH
Eddie,
Sorry for the late response....out of town.
You are correct. JP1 5-6 will put the P1900 into Standby instead of Hibernate. This means that the P1900 will continue to put out +19V after it has issued the ACPI pulse to your PC. It then shuts down the fan and monitors the current draw of your system. If the current is higher than about 1 amp it will shut down power to prevent the P1900 from being damaged (the fan is turned off in Standby mode).
Have you configured your mobo to go into Standby? Is it perhaps drawing more than 1 amp while in Standby mode? If so, this would cause the abrupt power shut down.