My one week old 2017 iMac 27 5K i7 R580 is having some moods This morning after setting my new workspace I've noticed strange red/green/blue dots on screen. What I've done until now (after each step computer was restarted): 1. all USB/audio ports disconnected 2. NVRAM reset 3. SMC reset 4. disk check with Disk Utility 6. changed RAM to factory one 7. NVRAM reset 8. SMC reset 9. restored factory settings with new user 10. disk formated 11. installed brand new OSX Sierra After all this steps problem still exists. Dots do not appear while installing system or in safe mode or while first phase of system loading (frist half of bar under Apple logo, then lots of dots). Photos and video are below. Any ideas? GPU or Power Supply Unit problems? Yesterday everything was fine Few dots on frist seconds of film and then 00:25. And now the question. Should I try to send it back (they delivered it 8 days ago so still got few days with return policy) or should I contact support on Monday and go with warranty path? We don't have in Poland official Apple Repair Center or Apple Store, only private company that got "blessing" from Apple .... but everyone hates them cause repair takes ages and often they blame user for breaking/damaging it even if it's not true.