I recently bought an arduino Uno. It is not possible to do an upload. I did check all suggestions in the "Why can't I upload . . ." all seems to be OK. I am using Windows 7 pro (and tried Windows 8.1 with the same result. I am trying to upload the "Blink" schetch. The verbose errormessage says "avrdude: usbdev_open(): did not find any USB device "usb"". In the controp panel I find the COM6 marked as arduino and the COM6 is also showed in the TOOLS section.
I did formerly make an project with the NANO, and had also problems here - but it is now running.
PS. The UNO is running the build-in blink program.
SvendBondesen:
The verbose errormessage says "avrdude: usbdev_open(): did not find any USB device "usb"".
It appears that the IDE is trying to find a USB ISP device instead of talking to the bootloader over 'serial'. There was an IDE bug where using "Upload Using Programmer" can cause the default programmer for a board to get changed. The work around is to select a different Tools->Board and then switch back. See if that works.
Have you tried closing and re-opening the IDE?
Thanks for the answer. To day when I opened the tools said NANO, changing it to UNO and it was suddently possible to upload - this was true for W7pro and W8.1.