I have an arduino uno rev3.
I can compile / upload / run simple programs (like led flashing, ...).
As soon as I plug the arduino Ethernet Shield 2 and power-on again the arduino, the program that was running previoulsy (led flashing) does not run anymore.
Furthermore, the upload of any software generates the following error:
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
I would like to mention that the Ethernet shield is an arduino one, not another model.
Who can help ?
Thanks.
Hi, @dunandji
Welcome to the forum.
Does your UNO look lie this?
If so look at the USB socket, it is metal, make sure it is not shorting on the shield when you plug it in.
A couple of layers of insulating tape should fix the problem.
Tom.. 
Hi Tom, thanks for your help.
The Ethernet shield is mounted (at factory) on a plastic support that makes the isolation. So no such problem.
Surprising that Arduino products show such incompatibility.
Got a voltmeter?
Check the voltage on the 5v pin. Is it 5v?
Check the w5500 for solder bridges.
yes 5V... measured, 3,3V is also OK
Hi,
The pins 0 and 1, they are the programming pins.
With the shield unplugged, check pins 0 and 1 on the shield, and see if they are connected to gnd pin on the shield, or have some resistance to the gnd pin.
Thanks.. Tom..
o, they are not connected to ground. Measured resistance is infinite between these pins and gnd
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