Screen Disappears

Lately, I will lose the screen I am working on for pictures to upload. How do I correct this, or do I need to bring my computer to the Mac store?
Thanks for any input.

 

When you say you lose the screen, do you mean the screen goes completely blank? Do you have to reboot your MAC to get the screen back?

Does this happen only when you are uploading pictures? Incidentally, where are you uploading pictures to? iCloud or another site?

 

that occasionally happens with me too.. all u can do is try to shut down the computer using the short cut key combination and restart it
im not quite sure what it is because i press all the command buttons + delete+ power button, but u can sure look that up and restart ur comp whenever this happens

 

Just out of curiosity, does it compete the upload?

 

One last question, does your MAC go into sleep mode while in the middle of the file transfer?