Hey guys, I just bought a second hand iMac. Specs: 2011 21.5" 4gb ram 2.5gb Core i5 500gb HDD First thing I did was wipe the HDD and install a fresh copy of Yosemite. Also installed windows 8. The thing is hell to use. Pretty much every thing I click give me a spinning beach ball for anywhere from 10 seconds to a minute. I've used macs for years, and I've never seen one running like this. Something is wrong, and I'm pretty sure it's defective hardware. The same thing happens in windows too. Both fresh installs. With 4gb of ram. Granted, that's not heaps, but it should be performing a hell of a lot better than this. What I'm not sure about is the best way to narrow it down to the culprit. I've tested it running with each stock of 2gb ram individually, but the issue occurs either way, so it doesn't seem to be the ram (unless both sticks are dodgy, but that seems unlikely). Any other ideas? CPU? Logic board? HDD? I don't know if it helps, but the internet seems to drop when it hangs sometimes. Also, I can still move windows around when its happening, although this seems to be the only thing I can do. Thanks in advance!