Im using a new Raspberry Pi 2 with the 3.5 RetroPie image, did the basic setup steps and installed the ControlBlock per the wiki instructions, using an Anker 2.1 Amp wall plug with a quality cable but getting the rainbow square icon in the top right corner of the screen suggesting not enough power. Bypassing the ControlBlock and I don’t get that icon, have tried 3 different wall plugs but the same thing happens.