Wait 10 seconds and then remove the power to the device whilst keeping the reset button pushed down, after 10 seconds power the device back on and keep the button down for a further 10 seconds (30 seconds in total). The time might actually be a lot loss but 10 seconds worked for me. The device should then boot up within 30 seconds. Connect your laptop to any port apart from 1 (This is used as the WAN port and is set to be a DHCP client by default). Once connected you should pick up an IP address in the 192.168.88.0 / 24 range. Point your browse to 192.168.88.1 and you should now have access to the RouterBOARD web interface:
From here select your method of connecting to the device and configure away.