Mid 2009 Macbook Pro 2.53ghz on Yosemite. upgraded 8gb ram and 500gb 7200 rpm hard drive. So it used to absolutely shred the internet, and now among it's other symptoms internet pages are loading super slow, videos don't stream fast enough to watch with any enjoyment. Tested against my brother's identical computer, his is lightning quick on our optic internet. Screen colour is totally shot. Super grainy and very light, the colour has no depth and sometimes writing is hard to read. White colour is the worst, most of the time just lines show up to replace white colouring. Using an external display and colour is great. While typing this my current CPU Temp is 74 degrees Celsius, fan running at 3250 rpm. Also keep in mind that when I use my macbook currently, I only have 1 program open at a time. So everything else, itunes, word, etc is quit. After not gaming for a while (because it's started having difficulty with most games) I started playing Minecraft and I'm usually running at 5 fps, the fan is aorund 6/7000 rpm and my temperature is around 85 degrees. I used to play World of Warcraft very intensely a few years ago and it had NO issues with the game. And for whatever reason I'd assume WoW graphics are a little bit more intense than Minecraft's. So yea just wondering if people can give me their thoughts on if my computer is toast or if I can fix it. I'm very electronically and mechanically inclined so if you have a suggestion that involves soldering lay it on me. I'd love to be able to fix it rather than buy a whole new computer which I can't afford. Also, tried to run AHT but like many people I'm unable. Tried option D and just holding D on startup, nothing, and I don't have my installation disks from 2009.