connected the wires wrong power pins

Arudoino Uno
If connect 9V to Power pins 5v is fail or not ? :roll_eyes:
After I connected the wires wrong. LED on uno hold all and usb not working.
Can fix it?

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Is your objective to power your Arduino using a 9 volt battery?

A way to safely power your Arduino with a 9 volt battery would be use use a 9 volt battery snap that plugs into the barrel connector of your Arduino. http://www.ebay.com/itm/2pcs-90-DC-9V-Battery-button-power-plug-for-Arduino-Mega-2560-1280-UNO-R3-132-/171065364307

On a side note, you should have a resistor in series with your LED. Tool for calculating resistor for LEDs: http://led.linear1.org/1led.wiz

Yes โ€œit would be failโ€

You have probably killed all of the devices that expect no more than 5 volts on your board. 1) the AVR chip used by arduino and 2) the device used to create the USB-Serial adapter.

Best advice: buy a new board.

karddd: If connect 9V to Power pins 5v is fail or not ? :roll_eyes:

Yes.

karddd: Can fix it?

No. Your Arduino is dead.