I have tried multiple operating systems...

  • Raspbian
  • Debian
  • OpenElec
  • Raspbmc

Two different SD cards...

  • Sandisk 2gb BE1210021871G
  • Sandisk 4gb

And two different Raspberry Pis. I cannot get any combination to boot. I followed the OSX install guide and have also tried to install from my Linux box as well.

When installing/booting I get a load of USB errors like...

raspbmc unable to enumerate usb device on port 1 (even when there are no USB ports connected)

Then after the first boot when I try turn it on again it just hangs on a black screen. Any ideas?

  • 1
    What power supply are you using? Aug 11, 2012 at 11:16
  • 1
    What is its maximum output current? What peripherals have you got plugged in? Aug 11, 2012 at 11:18
  • 1
    If the power supply is the only thing in common, it makes sense to suspect it. Aug 11, 2012 at 11:22
  • 1
    What were the exact commands you used to flash your SD card? Aug 11, 2012 at 11:37
  • 2
    The ever-present USB device is the hub/ethernet chip, unless you have somehow obtained a model A without. Aug 11, 2012 at 12:30

1 Answer 1


As others have mention, suspect your power supply.

From the Raspberry Pi Blog "Counterfeit power supply units in the UK":

Everybody testing returned units used in the UK has noted a problem out there with some power supplies, all of which appear to be counterfeit Apple chargers. We’ve all compared notes, and we’re all seeing the same thing: some of you are using chargers you’ve bought in good faith which are not the real thing, and which don’t behave like a safety-tested, properly engineered piece of hardware

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