Normally, the SlingStudio device should power up in either of these ways:
When the SlingStudio powers up, you should see the blue LED band across the top of its enclosure blinking. It is ready to use when the blinking stops. If this does not work, then you'll need to do some checking.
If you connected the SlingStudio device to its external battery:
If none of these measures work, and the SlingStudio device does not start up, then the SlingStudio device itself may be defective. Contact SlingStudio customer support for further assistance.
Note: For the first 90 seconds after the SlingStudio begins the power-up process, the Power button is disabled. You cannot interrupt the startup process once it has begun. This is by design.