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I know this has come up before, but the postings I read said there was a problem with !!! That was in 2010. I have been using a Uno for nearly a year without problems and now I got a mega 2560 and tried to upload the blink program. when it didn't stop unloading, I held the shift down and it gave me this message:

avrdude: usbdev_open(): did not find any USB device "usb"

My compiler settings are to mega 2560 and to port COM4. I'm on system MS 7 and I've reinstalled "the latest" arduino driver I can find... which is in the version 1.0.2 folder.

Assuming the !!! glitch was fixed long ago, can anyone tell me what the problem might be? As I said, I've compiled and uploaded to my Uno from this machine without problems. The Mega is the only new aspect.

Thanks for anything you can tell me.

joe
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whoops I meant to say it never stops uploading rather than it never stops unloading.
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The fix for "!!!" requires you have the latest bootloader installed on the 2560. It was only updated about 6 months ago and is probably not installed on your board from the factory.

Here is a link to the latest version of the bootloader:
https://github.com/arduino/Arduino-stk500v2-bootloader/blob/master/goodHexFiles/stk500boot_v2_mega2560.hex

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