Could you explain me please what is said on the screens? I tried reboot the sandbox today because I could not ssh the vm. So I used to reboot but the display looks strange. I have joined the 2 pictures showing the display.
@Oriane on first glance it might be that you have a faulty download. Can you do an md5sum check on your .ova file and compare it to the hash on the website? They need to be a match. Also, could you please update your question and post your computer specifications ( cpu, ram, etc ).