Hey guys, My mac mini (2011 i5 with AMD graphics) is playing up something savage! I CANNOT watch a youtube video or any movies off the internal HDD without them constantly skipping! The video will stop every few seconds and then play catch up while the audio plays back fine. However if I am playing movies from an external HDD they playback fine. I have reset the PRAM and SMC and run apple hardware test with no luck. Do youtube videos buffer onto the HDD? I’m thinking maybe there is something wrong with my HDD? Thanks in advance for any suggestions.