I am new to use RPi2 and all I did is following the documents and procedures given in raspberrypi.org. I have installed the latest NOOBS_v1_9_2 on my Pi2 and did some basic execution using Scratch. Good its all done, now I need to start doing stuffs which are needed for me.
I have utilized all the 4 usb ports for Keyboard, Bluetooth dongle for mouse, USB barcode scanner, USB Wi-Fi(Wi-Pi) adapter. Note: I need not boot from USB stick.
After I do a power off/on it doesn't boot, so I removed USB WiFi Adapter and powered up again, it booted again. Somewhere while googling I read that when connecting WiFi adapter, we need to use Powered USB hub, since RPi cannot provide sufficient current to drive the WiFi adapter requirement.
I tried with that option and identified it boots fine. So I need to know, why this is happening? The same Wi-Fi adapter works when I connect it to RPi after it boots. I understood that RPi is looking for code inside the Wi-Fi adapter. Is it because of USB boot option?