It seems that you are having some issues with the Slingbox PRO-HD since power and the logo lights keep flashing.
Although this issue might be related to a faulty power supply, I recommend you to check the following links. The first one will explain you all about the Slingbox lights and the second one will provide you with some steps to follow:
If the issue persists, I encourage you contact us as soon as possible. We will apply some other tests in order to determine if your Slingbox is using a faulty power adapter.
Hope this helps!