It's a PC, HP Compaq Pro 6000 Small Form Factor. It has been a great computer for 4 years. I picked it up on Overstock.com 4 years ago for like $250. I do a lot of audio recording on it and its never skipped a beat, no pun intended...lol. It runs Adobe Audition and Reaper 5 flawlessly. At least untill this morning. I recently got into video editing and jave been running Adobe Premiere Pro CC 2015 and its slow and choppy as heck. Maybe that put too much strain on it?