Hey everybody, I want to preface all of this by saying I already am schedule for an Apple Genius Bar appointment tomorrow, but before going I wanted to get the communities opinion. Here are the issues I'm experiencing: - Won't wake from Sleep - Hard Freeze requiring a reboot - Displayed image splitting (the left side of the screen suddenly jumps to the middle of the right side) - Horizontal/Vertical Lines - Will get stuck in the boot up and reboot one or two times (normally happens after the Apple Logo will disappear and vertical gray lines appear). (As of today) - Receiving Kernal Panics stating there is a graphic error These problems have been getting significantly worse over the last couple weeks. My initial thought is there is a problem with my discrete graphics card - Raedon AMD 6250M. There are tons of posts stating these cards are faulty and can wreck all types of havoc. Here are the troubleshooting steps I've tried so far: Disk Utility - Verify/Repair Disk Apple Hardware Test - Extended version (No errors found) Clean install of OS X 10.10 SMC/PRAM reset So far nothing has fixed the issue. Are there any other troubleshooting steps I should take before tomorrow? Also can somebody think of what else might be causing the issues. The only changes I've made to the computer are upgrading the Hard Drive and Ram, but those have been done since 2012 with no issues.