I've got a Pi book. Since last time I logged in, a new thing appears which asks me to enter username and password. It's called default xsession. This was already weird because it didn't happen before. If I try to login as Pi, blackscreen appears with a square colour (little rainbow in the corner) and I am in the login screen again. If I login as root everything works.

  • What book? What have you done? The devil is in the details.
    – Jacobm001
    Jun 16, 2015 at 16:04
  • Im german so yeah :D I mean ill probably just create a new acc. but just wanted to know why suddenly this Default X Session appears Book is that one: shop.heise.de/katalog/raspberry-pi-8
    – Selvie
    Jun 16, 2015 at 16:09
  • Is "the square color thingy" full screen (i.e., it's rebooting), or is it a littler rainbow one in the corner?
    – goldilocks
    Jun 16, 2015 at 16:12
  • little rainbow in the corner
    – Selvie
    Jun 16, 2015 at 17:09

1 Answer 1


Not enough reputation to comment, but the little rainbow in the corner is the pi telling you it doesn't have enough power. Check / change your power supply. Not sure if that will solve the problem, but it will at least avoid another one.

See here for information on the warnings.

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