I have a late 2009 iMac 21.5inches. OS X Version 10.9.3 Processor: 3.06 GHz Intel Core 2 Duo Memory: 8GB 1067 MHz DDR3 So my applications keep crashing randomly, sometimes theres a lag when switching from applications and even on the internet. Also when I was trying to load a lot of pictures, it took forever. My chrome is also having problems where my webpages keep crashing! WHAT IS WRONG WITH MY iMAC!? I tried to look it up and what I am guessing is that it could be the hard drive. Should I upgrade to a SSD? What is the best for my model, and any videos out there that can help a newbie at this kind of things? If it's better to get someone else to do it, does anyone know where I can go in Dallas, TX? THANK YOU FOR YOUR HELP!!!