einfallslose99:
I am using an Arduino Uno and I have the ARDUINO 1.8.5 installed. And on my computer I have Windows 7. But I've already tried it with a Mac Book, with the same result.And I've already tried several programmes which have all worked previously...
E99
So you have been able to load programs before with your computer, but the same programs now don't.
What COM port have you selected in the IDE, COM port allocation can change if you change controller.
Have you changed the USB lead?
Tom... 