I did do a search before posting but was unable to find the same issue, apologies if I missed the answer somewhere else . On one of my computers (XP Pro machine) I am unable to upload any sketch to my Uno. I Get the following errors:
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
I am able to use my laptop without issues, so I don't think it's the Uno. I've tried different USB cables, USB ports, removed & reintalled drivers, and ran a System Restore. Any suggestions?