[SOLVED] Network or USB not working - No form of input to Pi

[mk01]

few of people I know are using iPhone chargers fine, including me. anyhow I don't use mouse and if I plug in USB stick, RPI reboots.

this is caused by the low power from AC, is well known to happen.

try to boot with keyboard only, what happens. if it works, then it is with the AC. otherwise post feedback, we will check then.