Hi, Spiwrx
I'd check the laptop volt's any way, low volts to the opto diodes in the BoB can cause problems also.
in Config, Motor Tuning, Set the Step/Dir Pulse's to 5, See if that helps,(It gives the OPTO's a little more time to see the Pulses)
On the Gecko's, It depends on the size of your steppers, There are some jumpers inside the box.
What's your power supply Voltage and amp's rating, It should be close to 75 volts minimum for top speed.
Your steppers should be hot to the touch after being on for awhile if your current resistor is set properly for your stepper's.
Thanks, Chip