upgrade 2008 imac
I am starting to have trouble opening videos, seeing some content and getting online with some websites. I understand that it is because I am using Yosemite and/or my computer is just too old (made Feb., 2008). I would like to upgrade the processor, graphics card and memory. I currently have a 2.4 GHz intel core 2 duo processor, 4 GB 800 MHz DDR2 SDRAM memory and an ATI Radeon HD 2400 XT 128 MB graphics card. What can I use to upgrade?