After I took my Macbook Pro mid 2010 to the Apple bar to get serviced (they did a wipe and clean install) my screen keeps "blinking" - as in every minute or half-minute my desktop goes blank to wallpaper and all my icons "disappear" for a second and then everything comes back to normal. I've tried shutdown/restart, but the problem still persists. It's also not just a "too many things at startup" problem - it persists the whole time the computer is/has been on. I have 300 GB free on my 500 GB SSD, so I'm pretty sure it's not a space/startup disk full issue. I'm also not running anything too crazy - Chrome, Word, and sometimes Steam is all that's going on. I've checked my activity monitor - nothing is taking up space in the background, etc. I'm really not too crazy about going back to the Apple store because it's always at least an hour or an hour and a half with half an hour of sitting around.