My Amplifi 150 seems to have this issue and not all the time. Where i turn the switch on and i get a dim light in the B of the tone and a dim Bluetooth light.if i turn it off and on multiple times it will come on and stay on.the process can take a long time . I've dont some research to where Line 6 and other sources on the net that said it was the power board. To which i changed to a new one. With the same results. i updated to firmware 2.60, but have since downgraded to 2.50. Still the same issues. Once its on though(except for the Notorious Line 6 Bluetooth connectivity)it does work. i just wish line 6 products were half as good as their ideas.