Sometimes , i have this issue with graphic :
https://www.dropbox.com/s/tun0xabd3yvbt3s/IMG_6789.MOV?dl=0
How ti fix it ?
El Capitan 10.11.5 (15F34)
Mac mini (Late 2012)
2.6 GHz Intel Core i7
16 GB 1600 MHz DDR3
Intel HD Graphics 4000 1536 MB
That looks like a graphics problem.
Since your Mac uses system memory as video memory do you have the original memory installed?
You can try taking out one stick of memory and see if problem. If problem try reinserting that stick and taking out the other stick.
You can also try the following to help rule out a software proboem
- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
https://support.apple.com/en-us/HT201295
About NVRAM and PRAM
https://support.apple.com/en-us/HT204063
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
https://support.apple.com/en-us/HT201262
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
https://support.apple.com/en-us/HT201314
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
https://support.apple.com/en-us/HT204904
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
If still problem that would indicate a hardware problem. You can try running Apple hardware Test
Mac mini (Late 2012) Video Problems
