1.Increase your sandbox memory size.
2. 2ndly, if not showing "running" in VM, even though open the browser and try to open browser SSH or Ambari using the mentioned ip. Hope it will work as it worked for me.
I've also the same problem.
My VM has 10 GB and I've already verified the MD5. I left it running for more than 5 days and it never actually ends
My host system is HP Z240 i7-6700 @3.4 GHz with 32 GB Windows 10 Pro 64 bits
The loading screen remains in the check list and it never ends..
I've restarted it, deleted it, downloaded it, many times..
Has anyone been able to solve this problem by other means different that the ones described here?
Thanks in advance