Ok, first thing's first, I have a model B, Connected via a 1a, 5v microUSB adapter.
I have a USB keyboard and small USB mouse, neither register that they're receiving power (though the keyboard does not have any Caps lights etc)
When powering up using an iphone USB adapter, it continually reboots, showing some text and then the rainbow screen over and over.
When using the new one i purchased, it boots into berryboot but not Raspbmc. I cannot complete any kind of OS installation using berryboot however because the keyboard and mouse does not work, even when connected via a powered USB hub. Also, the keyboard states that it uses 75ma on the bottom of it.
Any suggestions? I'm hoping i just dont have a broken one because ive moved to mexico and the postage for replacing this one would make it cheaper just to import a new US one