can't upload to Duemillanove with Ethernet Shield

Hi I get this message when trying to upload to my new Arduino Duemillanove with Ethernet Shield.

Using Port            : /dev/cu.usbserial-A6008i9N
         Using Programmer      : stk500v1
         Overriding Baud Rate  : 57600
avrdude: Send: 0 [30]   [20] 
avrdude: Send: 0 [30]   [20] 
avrdude: Send: 0 [30]   [20] 
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude: Send: Q [51]   [20] 
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding

Uploading works fine if Ethernet Shield is unplugged.

I tried this as a boring workaround: 1. quit IDE, to release the serial port 2. unplug USB 3. unplug Ethernet Shield 4. plug USB in 5. start IDE 6. upload (now working!) 7. quit IDE 8. unplug USB 9. plug Ethernet Shield 10. plug USB in 11. start IDE

Ethernet communication works, but no serial on the IDE-serialMonitor

MacBook Pro Mac OS X 10.5.6 IDE: Arduino 15

any ideas? or is the ethernetShield partial broken?

ti_ko

hardware was buggy: new board -> everything ok