# "sh can't access tty: job control turned off" when i plug in the Unicorn hat **URL:** \ **Category:** Support\ **Created:** [January 12, 2016, 2:43pm UTC](https://forums.pimoroni.com/t/sh-cant-access-tty-job-control-turned-off-when-i-plug-in-the-unicorn-hat/1573 "2016-01-12T14:43:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Igor](https://avatars.discourse-cdn.com/v4/letter/i/dec6dc/32.png) [@Igor](https://forums.pimoroni.com/u/Igor)\ **Post date:** [January 12, 2016, 2:43pm UTC](https://forums.pimoroni.com/t/sh-cant-access-tty-job-control-turned-off-when-i-plug-in-the-unicorn-hat/1573/1 "2016-01-12T14:43:48Z")
Hello, I am new to the raspberry pi community and have a raspberry pi B+. I love to be able to program some light shows with the Unicorn hat but I came to a snag. Both the raspberry pi and the Unicorn hat are brand new so after the initial unpacking of the OS, i powered it down plugged in the unicorn hat and powered it back on. At boot up i got this line " **sh can’t access tty: job control turned off**". At first i thought it was the pi acting up so tried it several more times. Finally i unplugged the Unicorn hat and the pi started to boot up. I have searched the web but couldn’t find an answer to this problem. Any assistance would be appreciated. ---
**Author:** ![RogueM](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/roguem/32/311_2.png) [@RogueM](https://forums.pimoroni.com/u/RogueM)\ **Post date:** [January 12, 2016, 5:15pm UTC](https://forums.pimoroni.com/t/sh-cant-access-tty-job-control-turned-off-when-i-plug-in-the-unicorn-hat/1573/2 "2016-01-12T17:15:03Z")
I believe that what you see is the OS booting into a ‘safe mode’ of sorts. What are you using to power up the Pi? And what SD are you using? ---
**Author:** ![Igor](https://avatars.discourse-cdn.com/v4/letter/i/dec6dc/32.png) [@Igor](https://forums.pimoroni.com/u/Igor)\ **Post date:** [January 13, 2016, 9:18am UTC](https://forums.pimoroni.com/t/sh-cant-access-tty-job-control-turned-off-when-i-plug-in-the-unicorn-hat/1573/3 "2016-01-13T09:18:12Z")
@RogueM I have a 5V DC adapter with 2.1 A max output for the power up. As for the SD I got a 4 Gig SD card on there