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[Reply #15 on:]

avrdude: stk500_getsync(): not in sync: resp=0x00

I'm not sure why you would be getting the error since you only mention the single Uno board but I can easily bring up that error message by plugging the USB cable into a different (clone) Arduino Uno but still plugged into the same PC USB port.  I don't know if it happens with two "genuine" Arduino boards or if it's because one is a clone but Windows invariably changes the COM port number.

If I forget to change to port number in the IDE, I initially get an error dialogue box asking me to check the COM port.  However, if I then select the correct port and try to upload a sketch without restarting the IDE, I get that same error message:

avrdude: stk500_getsync(): not in sync: resp=0x00

I tend to think it's more a Windows issue than an Arduino.

John.

[Reply #16 on:]

did you connect something on pin TXD or RXD
That would prevent a download to your UNO

[Reply #17 on:]

It looks as though if I were to use Arduino I have to get rid of the bootloader and step back into the world of printer ports and DOS command lines which I thought I'd left for good.

I'm not sure I understand this comment. What have printer ports got to do with it?

You said it was working, and now it isn't. Quite possibly you broke it. There are a few things to consider. There is a maximum current you can draw from one pin, and a maximum from a group of pins. Also a maximum for the chip in general. These are documented in the data sheet for the device. Also if you happened to be testing a motor without reverse protection diodes you may have blown something.

This site documents a number of ways (10) you can destroy your chip:

http://ruggedcircuits.com/html/ancp01.html

However to be fair, you can destroy any chip if you are not careful. Personally I haven't destroyed any, and this includes after I have been drinking.

You can throw your Uno out the window if you want to. And then in a couple of months you might be throwing out your Microchip evaluation board.

I have a number of them sitting around my house doing things like monitoring if the garage door is open. I have to say that they are completely reliable.