Since upgrading to Yosemite my MacBook has had ongoing display and performance issues that I initially thought were a coincidental hardware problem, but now I am not sure.
For example, upon logging in the display flashes large horizontal stripes of white across the screen which become black as soon as the desktop black ground comes up. These disappear as after a few seconds however the same pattern is noticeable in some programs, for example white lines flash across the top half of the screen when scrolling in Chrome. Another issue that appears is that some programs, such as word or excel, have ghosted outlines of windows offset from their actual windows.
The performance of the computer has also slowed, taking a much longer time to open applications than normally and unable to load video within vlc or iTunes. I am not sure if it's related but I realised that the background had black bars across the top and bottom, as if it was being scaled from a different resolution. I was able to fix this by rechoosing the background in system preferences.
As I said I initially thought this was a coincidental hardware issue, however update 10.10.3 temporarily corrected the issue. However yesterday the computer froze and upon hard reset was back to displaying the same issues as before. I have reset the PRAM and SMC and tried to verify/repair the disk in recovery mode without finding anything.
I am fairly light weight on macs and their internal workings, so any help or pointing in the right direction would be appreciated.
For example, upon logging in the display flashes large horizontal stripes of white across the screen which become black as soon as the desktop black ground comes up. These disappear as after a few seconds however the same pattern is noticeable in some programs, for example white lines flash across the top half of the screen when scrolling in Chrome. Another issue that appears is that some programs, such as word or excel, have ghosted outlines of windows offset from their actual windows.
The performance of the computer has also slowed, taking a much longer time to open applications than normally and unable to load video within vlc or iTunes. I am not sure if it's related but I realised that the background had black bars across the top and bottom, as if it was being scaled from a different resolution. I was able to fix this by rechoosing the background in system preferences.
As I said I initially thought this was a coincidental hardware issue, however update 10.10.3 temporarily corrected the issue. However yesterday the computer froze and upon hard reset was back to displaying the same issues as before. I have reset the PRAM and SMC and tried to verify/repair the disk in recovery mode without finding anything.
I am fairly light weight on macs and their internal workings, so any help or pointing in the right direction would be appreciated.
