I just bought my second Raspberry Pie. The first has been running RaspbMC. Both are B models. But when I try to boot up the new one with the power supply, SD card and wireless usb keyboard dongle, it usually just shows the coloured square on the screen and then seems to completely freeze. I tried many times, also with another sd card, different power supply, with and without ethernet, with and without wireless usb dongle, but always the same problem. And the old Pie is running fine with the same accessories.
Once the new one got past the coloured square, but then froze up, but I haven't been able to reproduce even that since. The screen cap pic was too big for attachment, here's a link:
Is there something I should try before sending back the Pie for replacement?