If your Slingbox fails to have any lights illuminated at all while connected to a power outlet, then it certainly sounds like you're experiencing some power failure. I would highly recommend purchasing a replacement power supply off of our website here:
If you try a new power supply unit and it does not resolve the issue, you can return the power supply within 30 days for a refund.
Hope this helps!
Sling Media Forum Moderation Team
My Slingbox Pro HD simply won't power on anymore.... I noticed it today when switching out my router and no lights are on. I unplugged it, plugged it back in, and made sure the power cord was securely connected. Anybody have experience with this and what is the most common cause??