

Once you see the login screen press + F to switch back to full screen view. You may have to press the key combination a couple of times. Hit the + C to switch from full screen to scaled. The black screen has to do with screen view.

It has nothing to do with the change in storage, because to get the storage to actually change in the VM you need to do a few more steps within the VM after increasing the size in the Media Manager. I've seen this happen on many of my VBox VMs. Please contact the moderators of this subreddit if you have any questions or concerns. I am a bot, and this action was performed automatically. Thanks for taking the time to help us help you! Also, PLEASE remember to change the flair of your post to Solved after you have been helped! Your post has not been deleted - do not re-submit it. If you have met these requirements, you can ignore this comment. If this is your first time creating a virtual machine, we have a guide on our wiki that covers the important steps. Please also check our FAQ and if you find your question is answered there, PLEASE remove your post or at least change the flair to Solved.

Please check Google and the VirtualBox Manual before asking simple questions. PLUS a detailed description of the problem, what research you have done, and the steps you have taken to fix it. Whether you have installed Guest Additions and/or Host Extensions (this solves 90% of the problems we see) Whether you have enabled VT-x/AMD-V (applicable to all hosts running 6.1 and above) and disabled HyperV (applicable to Windows 10 Hosts) This is just a friendly reminder in case you missed it.
