Beaglebone Black REV B + 4DSystem LCD7 reboots after power on ?

Beaglebone Black REV B

4DSystem LCD7

boot Angstrom on emmc → /etc/dogtag=Cloud9 GNOME Image 2013.09.04

power DC 5v , > 2A

after power on I can see the beaglebone logo on LCD and then bbb reboot ?!

bbb without LCD7 is OK

bbb with HDMI is OK

tried :

  • BBB-ubuntu-13.10-2013-12-17-4gb.img.xz on SDCARD

same as Angstrom

  • bone-debian-7.4-2014-03-27-2gb.img.xz on SDCARD

same as Angstrom but after linux logo I see a few text lines asking for
user login just before board reboot

  • test with and without keyboard and mouse connected

  • test with and without ethernet connected

Anyone got same problem ?

bbb or lcd7 fault ?

what kind of test I can do ? (got only one bbb and one lcd7 …)

thanks for help

start message (bbb+lcd7+Angstrom emmc) :