F3500. is 3500mm per min?
If so, depending on the modal feed rate prior to this tool, you may need to add G98 for feed per minute. (as opposed to G99 Feed per revolution)
Typically I always add G1 G98 or G1 G99 to the first cutting line of a tool block so I am sure which feed mode I am in.
Since your (main) spindle is not spinning and you may still be in G99, the machine is reading 0 feed due to 0 RPM, and thus the machine appears stalled, though it is only doing what you told it to do =)
Try that to start