X11 unknow problem

hello,
I encounter an unknown problem, very bizzard. I installed OpenBSD 6.2 on my
laptop i386 dual cores, I installed Gnome3 without error, then the demon
does not launch or are in irreversible errors it leaves the prompt "#" for
root and "$" for a normal user the operating system crash!
So I decided to install XFCE4 and ditto the bone crash after rebooting.
So I decide not to install windows manager and I run startx on a new
installation, ditto the operating system crash console display a prompt, ">"
with some command that does not work, I'm forced to turn off by the power
off button. the system, reboot and this time it tells me that sshd is
corpulent. I do not understand what happens on this laptop, I have an intel
video processor, FreeBSD 11.1 + Gnome3, works very well and debian 9.3, I'm
multiboot.
I have never encountered such an error. what should you think of it? 

Regards 
Philippe



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