If a CueSpider boots to the logo splash screen, then to a completely blank screen, its software has become corrupt and it will need to be restored.
To do this, locate the pinhole button at the top of the unit. Power the unit up while holding this button. The LEDs will turn blue, then turn off. You will then see the logo splash sequence. Keep holding the button until the LEDs turn blue again. You can then release the button.
The CueSpider will then be restored to factory defaults, so you will need to reconfigure it to work with your network.