Shift key randomly ACTIVATING.

I agree Rany - 8 GB should be enough RAM for most tasks.

I'm still on the fence on SSD's. The problem is most people buy too small a unit so they encounter problems when they have overloaded them as the costs are still high for the larger units. SSHD hybrid drives are a good 1/2 step if the user plans to carry a lot of stuff on their drive.

This system can support 16GB but it needs to be running the newer system firmware (EFI).

if you decide to buy a ssd Retro Humor must be compatible for 3g, I Vito problems with some Samsung SSD 840 who had 1.5g speed, when the older model Samsung 830 instead managed to go to 3G. the best in my opinion are as compatibility OWC but they are very expensive compared to Samsung and crucial

@smilzo - The Samsung 840 EVO SSD won't have any issues in this system. BTW the Samsung 840 SSD is a SATA III (6.0 Gb/s) drive that also runs at SATA I (1.5 Gb/s) and SATA II (3.0 Gb/s) as it has auto sense technology like the Seagate SSHD drive so it will work in most every system out there as a replacement drive. There is a known issue in MacBook Pro's if you try to use a auto sense drive in a dual drive config as the optical drive SATA port has a problem. Here you will need a fixed SATA II drive for it to work.

hello @danj , the Macbook is israel 2010 and has no problems. I guarantee that the 2009 model 's Samsung 840 SSD replaced lriginale has 3GB HDD speed, but 1.5. It happened to replace it and verify that it does not work, instead of 830 runs at 3BG. unfortunately on this occasion I had to replace the SSD, the problem is known 2009 model motherboard controller anyway thanks very precise answers

@smilzo - We have e a few in this series all running with a Samsung 850 EVO SSD's as their primary drive. All are running @ SATA II (3.0 Gb/s). The only issue with the logic bd is when you try using the dual drive config. In that case you need a fixed SATA II drive otherwise you will have a problem as you describe. I don't recommend dual drive setups in the Unibody systems.

Did you make sure your firmware is unto date and did you replace the SATA cable? Both are known issues that need to be checked.

You'll need this cable: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104. We are constantly replacing these cables as they go bad and the first generation of the cable had problems.

I have replaced the keyboard entirely. When using keyboard viewer, I see the shift keys randomly turning on and off.

so even with the Apple keyboard viewer have the same problem? you have already tried to restore the operating system, or format and install a fresh copy of OS X?

you should free up space in your HD because strange things can happen like this

Don't use any spray cleaners!! All you'll do is make a mess!

You have the right idea here cleaning under the keys. But you'll need to use a high grade isopropyl alcohol (85% or better) as you want it to evaporate not leaving a gummy residue. Most spray cleaners have silicon oil in them which will act as a dust magnet and if you over do it a squishy mess!

You may need to replace the keyboard if a topical cleaning doesn't fix things here. But follow Mayer's lead here you may have other issues.

hello dan when cleaning spray to coat products with dry contacts are specific agents that leave no residues.

Israel I'm glad you've solved freeing up space in your HD, unfortunately the lack of space often causes less known issues .... to me the battery was no good working keyboard and trackpad

The problem you face here is people don't know the difference! Dry only means it has Teflon in it which will also mess up the keyboard.

Even still I find they only push the junk in deeper. Best not to use them on keyboards at all.

Frankly, I have my own pressure can which I can load up with a solvent of my choice. I will either use distilled water or isopropyl alcohol that's it!

I hate to tell you how many sprayed keyboards I end up replacing from spray damage.