program does not start when supplied with external power

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hi,
i got sketch starts , runs when arduino uno connected via usb cable computer.
however, if arduino uno supplied external power (non-usb) not run. see leds on arduino on gets power. it's wall cube 9 volts.

i tried sketch , same effect. tried reset arduino did not sketch started.

how can start sketch if supplied external power ? need start sketch ? what's difference between usb power , external power concerning starting of sketch ?
thanks help.
regards, agebee

sounds more defect in powersupply line. fuse maybe? should start. follow line external power supply 5v regulator. checked schematic. there no fuse power in. usb. there diode coming power connector whichs leads 2 5v regulators. i'd start checking there.


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