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  1. Hello @JColvin and @jpeyron The problem is solved by first uninstalling the driver and install it again. Thank you both for your help. Ahmed
  2. Hello @jpeyron The operating system I use is Windows 7. I will post all the screenshots when I get them. Thanks
  3. Hello @JColvin I have tried to install the cable drivers again but no use. Trying also different USB port was not beneficial.
  4. Hello, I have a Nexys 4 DDR board and I was going through the tutorial. I installed the suite and when I reach the point to connect the target, Vivado is unable to find it. The jumper of the JTAG is right and I tried more than one USB cable. The error I get on Vivado is "No hardware targets exist on the server [TCP:localhost:3121]" Your help is appreciated. Ahmed