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2.2 GHz (Turbo Boost up to 3.4 GHz) or 2.5 GHz (Turbo Boost up to 3.7 GHz) quad-core Intel Core i7 processor with 6MB shared L3 cache.

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Odd multiple behaviors (black screen, double clicking, bluetooth)

I have a MacBook Pro. 15" Mid 2014. Retina Display. 2.8 GHz. Iris Pro 1536 MB.

I will go in the order the prominant problems that have appeared:

1) Any USB Mouse connected via cord or dongle will randomly but commonly left click TWICE when I press just once. Does not happen with the trackpad or a bluetooth mouse. Troubleshooting done: Changed mouse (brand, age [new/old], USB 2.0, USB 3.0), switched USB port used, downloaded any drives I can find, and even tried to plug into USB hub that had its own power supplied.

2) Occasionally the bluetooth would stop working (the icon has a horizontal line through it while the actual logo/icon is greyed out). I would have to restart the computer to have it start working again.

The following are of the most concern. The above two I can deal with.

3) During high usage the screen would suddenly go BLACK. (e.g. when lots of browser windows open, during or after playing a video game, or watching a movie at the same time as having some browser windows open. Basically when high usage of either the CPU or Memory). After the black screen occurs if video or audio is playing the audio part would continue for a minute or two then stop. Force restart or force shutdown required. Troubleshooting done in no particular order: update Mac OS, disk utility repair, permissions repair, reset PRAM, safe mode, OS recovery, checking other users (old and newly created), etc. I do not have nor know of a good hardware scanning program to use.

4) Randomly the screen will display odd behavior. This is the rarest as it only happened twice. The screen would still work, however, it would be shrunken down flush to left of the screen, duplicated THREE times, tiled vertically (every thing will still work, mouse, typing, etc); while on the right of those three small screens would be odd repeating pattern of bars and parts of the screen background.

5) Luckily, I still can use the laptop normally as long as I don't do too much multitasking or graphic intense activity.

Possible Solution:

I would assume that a replacement logic board or maybe memory is required.. Because of so many issues that seem separate I am leaning hard towards a logic board replacement. I have attempted to find a replacement but am unsure about EXACTLY which one to pick. I have contacted iFixit support but the three available boards only say 2.2 GHz, 2.0 GHz, and 2.3 GHz. No 2.8 GHz. I was asked about the graphics which I am unsure where to look to clarify what kind I have (discrete, integrated, dual).

I haven't yet opened this specific laptop (I have done repairs for several older laptops) so I hope someone also has a suggestion for a repair tool kit.

Mahalo! (Thank You)

- Chris

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Try to restart you Mac while pressing control + R and enter recovery mode run hardware check from options if any hardware error it will guide you about that.

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