That won't work, I can't get a serial connection going on the computer side.  Windows 7 recognizes the arduino and assigns a COM port but no application I've tried establishes a serial connection to it.

I was testing a custom L293D motor shield and powering the whole thing through USB, I'm wondering if it didn't draw too much current.

Hi,

I think I might have burnt the USB chip on Mega 2560.  Windows still recognizes the device(on COM12) but the IDE and terminal programs won't connect to that port.  The program I had loaded earlier still works.

I have tried changing the COM port and that didn't work.

It works with another 2560.

When I power it up the TX RX LEDs don't blink, but the power LED is on and LED 13 blinks twice.

Is it possible that it's only the bootloader?

If it is the USB chip, is there another way of programming it or do I just chalk it up to experience?

Aymeric