I just bought a refurb 2.8Ghz iMac about 3 weeks ago. I upgraded to 4GB RAM purchased from Crucial. I used the Time Machine backup from the Macbook Air that I sold to transfer my entire system over to this computer the day I bought it (OS X had been installed fresh on that computer less than 2 months before). Everything had been running great. I have been using Plex a lot to watch some of my Blu-ray rips. VMWare with XP & Windows 7 was also running great (as well as everything else I run). Yesterday I was using Mac The Ripper to rip my DVD collection to my unRAID server, downloading some TV shows I missed last week with uTorrent, and browsing the web with Firefox. Everything started running terribly slow. All the programs were still working but were basically unresponsive. I had the little spinning beachball going. I finally got everything closed and restarted. Once booted back up I started running Mac The Ripper again and couldn't even really get Firefox to run at a useable level. I shut down the system this morning when I left for work and thought I would take another crack at it when I get home. I've been a Windows user for 10 years until the last 6 months when I switched to Mac. When this kind of crap happened on my PC, I would wipe the system and reinstall. I was wondering if a system file got messed up or if my hard drive is failing already. My hard drive is only half filled up, and I saw nothing out of the ordinary on Activity Monitor. In fact, Activity Monitor showed that my system wasn't being taxed at all, but it was still really really sluggish. The only thing I did differently was delete the system DVD player because it was starting automatically as I put in each movie for MTR even though I set it not to in preferences. I just dropped it into the trash since I will never use it anyway. So should I reinstall OS X? I'm using Time Machine I just reformatted the Time Machine drive to make a partition for my Mac Mini, so it only goes back a day or so. I'm up for recommendations. Thanks! BTW - the system takes forever to restart since this problem started last night. It hangs forever at the white screen.