MacBook display has vertical black and white lines on startup
displayerrormacbook prostartup
My MackBook, on startup, its showing the following:
They are just a bunch of vertical black and white lines, and it gets stuck there.
What could be the problem?
Best Answer
It's definitely hardware. It's either the display has gone bad or your GPU (logic board) has gone bad (most likely case)
The first thing I would do is hook it up to an external monitor. If it's present there as well, then you know it's GPU/logic board related. If it goes away, then run Apple Hardware Test (AHT) to get some details. (Hold the D key while booting from a powered off state with the AC adapter connected)
Either way, you will need to take it in for service.
• Go into Displays Preferences > Check Mark the box for "Show displays in menu bar"
• Under the resulting icon in the menu bar, drop the menu and set "Number of recent items" to 10.
• Click the menu again and you should see a list of recently used timings/formats. Multiple 1920 x 1080 might appear, switch to one or the other and it might just fix your issue.
Also:
In Displays Preferences > Displays > “Options” tab/button near the top of the window and make sure the “overscan” box is checked.
It would be helpful to know if you're trying to run 1080i or 1080p, and what model of your external display is.
This is where the screen isn't being evenly lit by the CCFL bulbs behind it. Some of them are outputting differing amounts of light and cause this perceived 'discolouration'. The lighter colours really do show it.
Unfortunately, this is one of the disadvantages of a CCFL backlight system as opposed to something like LED backlighting - backlight uniformity can become an issue, especially with time.
You'd be looking at a screen replacement - outside of warranty, that's gonna cost you.
Best Answer
It's definitely hardware. It's either the display has gone bad or your GPU (logic board) has gone bad (most likely case)
The first thing I would do is hook it up to an external monitor. If it's present there as well, then you know it's GPU/logic board related. If it goes away, then run Apple Hardware Test (AHT) to get some details. (Hold the D key while booting from a powered off state with the AC adapter connected)
Either way, you will need to take it in for service.