Arduino green light on but no response!!!!

Hi
i think i short circuited my arduino by mistake. now when i plug it in the usb nothing happens!!!!!. is there a way i check if its dead or its maybe just the ATmega328 IC thats gone?

Which arduino are you using ?
and what happens when you connect aux power to it ?

Have you already done the loop back test?
Check it
http://arduino.cc/forum/index.php/topic,73748.0.html

hi there,
I have an arduino uno. i was fiddling with it. i think i short circuited it somehow cause my entire laptop shut down and wouldnt start i had to unplug the laptop battery and plug it back in...only then my laptop started up. but when it did and i hooked up the arduino usb cable to the computer...nothing happened, the computer didnt even detect a usb device or anything. the only thing is that the 'on' green small led gets turned on when i hook it up to the computer. i tried ur method. for the loop-back and it didnt do anything. any suggestions. thanks in advance.
cheers

Ahsan K

its Arduino Uno. and i tried the loop-back method...nothing just green led on when i hook it up to the computer. :frowning:

@prowler_sn: Please do not cross-post. It wastes your time and it wastes the time of the people trying to help you. This is the best place to discuss the problem you are having with your board.

sorry

Do other USB devices still work with the laptop?

yup everything works fine except Arduino Uno:(. i have tried chnging the usb cable to power the arduino but no luck. i think i have to assume that its dead:(

It is unlikely but possible that the firmware on ATmega8U2 (the processor that communicates with the computer) has been damaged or erased. If you have access to an In System Programmer (ISP) you might try reburning the firmware. Another board can be made to work like an ISP using the ArduinoISP sketch.

doesn't Arduino board Uno has ISP capabality?

It does when running the Arduino ISP sketch. To reburn the ATmega8U2 firmware you will need a second working Uno.

I'm having the same problem with my board, seems to be a issue of fiddling gone awry as well.

Ive done the loop back test, with no results. com 4 has gone away, there is no insertion sound when plugging into USB. green light goes on LED13 flashes when inserted, pressing reset on the board causes the LED13 to flash three times, pause, and rapidly flash again.

does this sound like the bootloader is fried? is there a solution to this problem short of getting a new board and chip?