Hi whene I conect the Arduino UNO whith a USB to my computer. Then I can't see the I don't get any comunication whit the Arduino UNO to my computer. But the Arduino get power from the computer. So what do I wrong.
do you have the IDE installed?
what version?
what board do you have selected?
what com port do you have it set to? (same as the Arduino is on?)
I have Arduino 1.0 installed on my computer. I have selectet Arduino UNO and Com port have I selected port 4 becuse it is the only one that I could use from my Arduino 1.0
I havent 'upgraded' to 1.0 IDE (nothing but problems from what I read...for beginners at least) 
when you communicate or try to upload a sketch what error message are yo getting?
I get this error: avrdude: stk500_getsync(): not in sync: resp=0x00