Unable to Upload Sketches

Hi, I have a Diecimila board and have been using it to great success with my MAC OSX 10.5.4. I was trying a 16 X 2 LCD for the first time. I had it all wired up and I had uploaded the LCD4 example, but received an error when running it. I also noticed the green light was very dim . I probably had not wired it correctly. I have taken off everything and am now trying to upload the sketch Blink, but receive the following error: avrdude: stk500_getsync(): not in sync: resp=0x30 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

I have pressed reset many times at different intervals to no avail. Have I damaged my board? How can I upload sketches?