PC and processor are connected and software is started, but PC does not recognize the processore.

Check if the power on the processor is on (whether the fan is spinning). If the power is not on, see if AC adaptor is not loose at the connecting part.
Sometimes restarting the PC solves the problem, so restart the PC and see if it works.
If you are using Wintek Laser and processor is not recognized even though power is on, see if the driver is installed. (URL for driver installation is in the manual)