I'm using the download on the Raspberry Pi site. I'm using the best power supply I could get, designed for Raspberry Pi, 3.0 amps. The only things plugged in are a USB mouse and keyboard. The LEDs do nothing, the red one lights, but that's it, no activity on the other. The monitor does not show anything, but has a signal. There is no rainbow pattern. Like I said, the only thing that works is Raspbian. I've even used the exact same thumb drive as Raspbian is on to try Ubuntu MATE, no go. Like I've said, I've tried several new flash drives and several different downloads.