MacBook Pro Retina 15" mid-2012 won't boot in clamshell mode with an external display attached

I have a 15" MBPr mid-2012 running OS X 10.10.1. The system won't boot in clamshell mode (power is connected, lid shut) with an external display attached via an Apple Thunderbolt->DVI adapter. it boots fine if the lid is open. It isn't the adapter or the display since my 15" MBPr mid-2014 boots up just fine connected to the same adapter and monitor. And this system used to boot like this just fine some while ago (probably before it was upgraded to Yosemite). I've reset the NVRAM (twice) to no avail.
Has anyone encounter this? Anyone have a solution? Should I try an SMC reset (always a bit nervous about that)? Might it be a driver issue in Yosemite?
Thanks.

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Macbook Pro Retina 15", Mid 2012 - High Speed HDMI Cable

I got a High Speed HDMI Cable with Ethernet that supports up to 4096 x 2160 pixels. I conncted my macbook pro retina 15" to a 27" monitor that supports a resolution of 2560 x 1440 via this cable, but the maximum resolution it's 1080p.
I am pretty sure that the video card supports this kind of resolution since it's NVIDIA GeForce GT 650M 1024 MB and HDMI Cable to.
I am a web - front end developer and I have a windows machine and I need to switch betweed the 2 for testing.
Does anybody have a solution for this?

I got a High Speed HDMI Cable with Ethernet that supports up to 4096 x 2160 pixels. I conncted my macbook pro retina 15" to a 27" monitor that supports a resolution of 2560 x 1440 via this cable, but the maximum resolution it's 1080p.
I am pretty sure that the video card supports this kind of resolution since it's NVIDIA GeForce GT 650M 1024 MB and HDMI Cable to.
I am a web - front end developer and I have a windows machine and I need to switch betweed the 2 for testing.
Does anybody have a solution for this?

Macbook pro retina 15 mid-2012 display problem : solution :)

Well. This topic is not really a question, I hope this could be a solution for both users and Apple. Its free, but if Apple wants to offer me a full options Mac Pro, or hire me as consultant we can discuss ^^
The story is long, but is worth. Sorry in advance for my swissy english. I hope you'll enjoy.
As many of retina mid-2012 owners (and perhaps other versions) I encountered the symptom of my machine crashing more and more frequently (from once per week to more times per day). Crash usually with a message of "read error" or some display related crash dumps, often linked to the switching of graphic card (integrated<->dedicated).
For a long times a suspected some burnt chip (because of using 1-3 external screen all the day) and seeing istatmenu with crazy temperatures of 90-105°C. I was disappointed because of the evolving symptom (crashes more and more frequent and sometimes no display at power on)
It took me ages to discover what exactly did my MBPR crash, as it was crashing "randomly" for me. Sometimes after crashing, hard shutdown and restart, it wouldn't display or even power on the backlight, for one hour or one day and suddenly it would display again !!
I tried all the solutions found here and there including replacing the thermal paste, smc or pram reset -> no luck.
I took it to my local Apple provider and I was told I would have to change the motherboard. An expensive operation, since the warranty was expired by 2-3 months.
So I bought a 13 inchs retina as replacement and continued to diagnose my 15 inchs in parallel.
I discovered that it would crash if I bend it : Power on, one hand on each side applying a light bend in the two directions made my MBPR crash. So suddenly the problem wasn't random anymore. Mouhahahaha. This could be motherboard or chip related (de-soldered solderings here or there), or case related. Let's hope the problem's not mobo related.
I opened the case and tried to see in the dark if I could see a mini lightning when bending (because of a bad ground somewhere). -> No luck
So I tried to put paper here and there to try to locate the potential bad ground. Booting, bending, hard shutdowning, papering, booting, bending,...
And suddenly the darkness became light : If I put a paper at the right place, my MBPR will resist to the bend test. Was my mobo alive, and was this nightmare only a progressive bad ground ? Yes.
Here me good : the progressive symptom of random crashing of my MBPR (which I imputed for a long time to an old chip since the symptom was the same under windows 7 bootcamp + because of the graphic switching behaviour) was in fact only a bad contact at a very given place.
The very given place (my diagnose and my solution) ?
The screws of the left's fan (thunderbolt's side) or/and the fan case itself are screwed through the motherboard. For a reason (temperature, mecanic constraints or corrosion) this stuff entered in contact with each other, the redox gained the near electronic motherboard tracks (especially the thunderbolts one I guess).
Proof :
If I put a piece of paper between the motherboard and the case, I can bend my MBPR without it to crash and use it as before (except for external screens).
My diagnose :
once the material of the screw/fan case/motherboard track enter in direct contact, there is a corrosion effect that affects more and more the neighboor.
Here is a pic of my repair :
I can now :
play hours in windows 7 bootcamp
switch between graphic cards with gfxcardstatus (even with a playing itunes animation)
sleep and wake up with integrated or dedicated graphics
I can't :
connect a screen through thunderbolt since it activates the corosionned part of my MBPR, so it will work for a period of time but will assure me that a crash is awaiting (perhaps after a wake up or randomly from this time)
I'm confident that this problem is conceptual and that a big part of 15 inches retina mobo's exchanges are due to this question.
Hope this helps
Kisses from Switzerland

I tried to diagnose this mid 2012 retina 15 inchs for a couple of month now. With a very similar symptom of a lot of people :
some that exchanged the motherboard more times and experienced again the same freezes / shutdown again
some that installed mavericks by believing it workarounded the problem (but majority also says after a while that actually the problem was only differently reproduceable)
some hoping Apple to release a sowtware fix for that or a recall of the concerned machines
I now think to have isolated one of the cause of such symptoms. At beginning I thought that the fan electric insulation had worked but actually not.
Solution for me :
open the under case
dismount a bit the two fans
insert paper bands under the motherboard (between the black bottom and the motherboard, I used ~120gr/m2 paper and cut it into bands of 10-13cm by 2-3cm).
I would have dismounted the motherboard if I had the right screwdriver, but this seemed to be a too long/hard work, so I went into this idea that my motherboard was ok and that the problem was only caused by a supposed short-circuit under the motherboard.
My thoughts :
The more big the hole in the black tape under the motherboard, the more frequent the freezes / shutdown due to a short circuit (electronics grounded at the false place because of the mobo entering in contact with a grounded metal part through the black tape)
I also thinks this short circuit is more dedicated graphics linked than integrated and that this is the reason why the symptom persists or reappear even after multiple motherboard exchanges for a lot of people and the reason some people use their machine with forced integrated graphics
This solution should apply as self doable for a lot of people
If I should bet, I think that the black insulating tape under the keyboard is scratched by the time (mecanic constraints on the chassis) by some mobo component until a false contact is created through the insulating tape
I can now (mid-2012 retina 15 inchs I7 8go 256go, osx 10.10.2) :
run firefox or VLC with integrated or dedicated graphicssleep/wake with integraded or dedicated graphics (forced or auto-switching) with such programs runningrun multiple screens (2x TB + HDMI at the same time), sleep the machine, unplugging 1 of the 3 screens during the sleep, wake the machine + bending the machine during the process without it to crash. \o/
The goal of this post is to share this amazing experience with both Apple and the users facing such a problem.
Problem solved without motherboard exchange and with a quite easy workaround

Macbook Pro (Core Duo Mid 2006) won't boot

My macbook pro won't boot. I'm suspecting that the HD has gone out again, but I also don't seem to be able to boot from a CD. When I startup, it gives me a grey apple screen with a spinning gear. I tried running disk first aid from the command line and it said the B-Tree was corrupt and could not be repaired.
What has me confused is that I am also unable to boot from a CD/DVD. When I startup with a CD in the drive, it spins up and then ejects. If I insert it again, it spins up again, then spins slower, but I can still hear it spinning and just hangs. It seems to make no difference if I hold the C-key or not. I have tried 3 different MacOS X disks and a DiskWarrior disk all with the same result.
I've also tried zapping the PRAM and letting it sit unpowered with the battery out.
Leading up to all of this, the computer got very slow.
Any ideas? I'd like to have a feeling that my CD/DVD drive isn't broken before I spend any money on a new HD. The computer is 6 years old, but I'm just not ready to spend another $1-2k on a new one.
Thanks

kert2 wrote:
The computer is 6 years old, but I'm just not ready to spend another $1-2k on a new one.
You got 6 years out of it, it's 1.5 years past average of 4.5 years, hopefully it's a software issue.
Run through these User Tips, it's for 10.6 which you should be on (call Apple via phone for the 10.6 disks) and give it your best shot to extend it's life a bit longer.
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/?p er_page=50

MacBook Pro 13 inch (mid 2012) v MacBook Pro 15 inch (mid 2014) for After Effects and Premiere

Hi everyone,
I'm interested in working with After Effects CS6 and Premiere CS6 probably creating quite heavily layered files and experimenting with and combining effects. (I also work with Photoshop and Illustrator.)
My workplace allows me to use a 2.5 GHz Intel Dual Core i5 / MacBook Pro 13 inch (mid 2012, non retina) with hard disk and integrated graphics card (Intel HD Graphics 4000 512MB). I understand this Mac can be maxed out at 16GB of RAM. (Official Apple specs I realise say 8GB RAM is the max for this computer but I've looked into this thoroughly and have confirmed that 16GB is in fact possible.)
I'm considering purchasing one of the new Haswell based MacBook Pro (mid 2014) models for myself.
If I do, I'll get the retina 15 inch / Intel Quad Core i7 / 16GB RAM / Intel Iris Pro Graphics / NVIDIA GeForce GT 750M / 1TB Flash Storage.
I realise there is a big difference between these two machines in terms of their specs - the 15 inch with the dedicated GPU will be far more suited to motion graphics work than the lower spec machine with integrated graphics card.
Currently, my understanding is that After Effects CS6 and Premiere CS6 do not support the NVIDIA GeForce GT 750M but from research on the net I believe it's possible to add this video card to the list of supported cards within the respective applications, forcing them to recognise and use it.
Having read about the upcoming Broadwell chip, which I think may be capable of supporting 32GB RAM (possibly coming in Q2 2015 from the various websites I've visited) I wonder if it is worth holding off my purchase, and maxing out my older 13 inch laptop in order to run After Effects and Premiere for the time being.
If I waited for Broadwell based 15 inch MacBooks I think its likely they'll be expandable to 32GB RAM, making the computer a better long term investment.
eg if Adobe increase minimum/recommended memory requirements for their software in the next few years. While I don't know for sure this will happen, it does seem quite likely at some stage. The 2014 15 inch MacBook - while an excellent computer at the moment - could potentially be slightly limited with regard to future Adobe software releases as its max RAM is 16GB.
I realise I could potentially look at a high end iMac if memory is a concern, but I prefer the portability of a laptop so I'm restricting myself to portable options for the moment.
What I'm wondering is -
If I install the 13 inch 2.5GHz i5 laptop with 16GB RAM as is possible, how would it perform when running After Effects and Premiere? It currently has 4GB and it very quickly runs out of memory meaning playback of goes very slowly when previewing complex files in the timeline. This necessitates rendering of small test sections of the timeline to see it at the correct frame rate. Would the move from 4GB RAM to 16GB RAM give me a noticeable improvement in this regard? If so then this is tempting as I don't have to pay for it - I think my workplace will cover the cost of extra RAM. And then I can wait till next year to buy my own high end laptop.
The 15 inch 2.8GHz i7 quad processor has Iris Pro and dedicated NVIDIA GeForce GT750M with 2GB RAM. I would be paying the full cost myself.
I realise rendering would be faster with this Mac but would I see a noticeable improvement over the maxed out 13 inch laptop when previewing multi layered After Effects and Premiere compositions / sequences within the timeline? I like the idea of being able to preview footage in real time as I'm editing as it saves time and I think it makes the process easier generally.
Any thoughts welcome and thanks very much in advance for your time and advice.
Kind regards,
John

"It currently has 4GB and it very quickly runs out of memory meaning playback of goes very slowly when previewing complex files in the timeline."
"In this case yes, I can most certainly see a performance increase as your machine is still not too old and a RAM increase will help it for sure I just can't tell you by how much.
I own the same machine as yours (except for mine having 2.9ghz and i7, and 8GB of ram) so I think it's safe to say for me that the RAM increase will help you for sure."
That statement of mine answers your question you just asked

My macbook pro runs slow, iTunes videos keep stuttering. Nothing has worked to solve this issue. Macbook Pro 13-inch mid 2012 2.5GHz i5 with 8GB RAM upgrade.

Hello everyone.
I have been having this issue for a few months now and nothing works to resolve it. The biggest issue is that iTunes videos constantly stutter ever few seconds, the audio portion of the video is not effected. The most I have open at once is Safari, Skype, and iTunes, and possibly Open Office. Videos will even stutter with nothing else open other than iTunes. At times it sounds like the computer is running something in the background from hard drive noise.
I even upgraded the RAM to 8GB and it still has this problem! Nothing looks wrong in Activity Monitor other than occasionally the memory usage spikes up to 6GB, but even then the memory pressure graph is green. I dont understand how these non-intensive programs can use that much. The hard drive is barely 1/3 full.
Please help with a solution as nothing has worked so far. Thanks!
Macbook pro 13-inch mid 2012
2.5GHz dual core i5
8GB DDR3 RAM
500GB HDD
Intel HD graphics 4000

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this test is to determine whether the problem is localized to your user account. Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault in OS X 10.7 or later, then you can’t enable the Guest account. The "Guest User" login created by "Find My Mac" is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

Upgrading ram for MacBook Pro (13-inch, mid 2012)

I am using this
MacBook Pro (13-inch, mid 2012)
4 GB RAM
2+2
Can i upgrade to 6GB ??
4 + 2GB
Can u suggest me

Yes, assuming it isn't a Retina model.
Maximum Memory
16 GB (Actual) 8 GB (Apple)
Memory Slots
2 - 204-pin PC3-12800 (1600 MHz) DDR3 SO-DIMM

HT204032 Can i get powernap on my Macbook Pro 13 inch mid 2012 with mountain lion running on it ?

Can i get powernap on my Macbook Pro 13 inch mid 2012 with mountain lion running on it ?

Welcome to the Apple Support Communities
Power Nap only works with Macs with flash storage, and it requires a firmware update that it's only supported on a Late 2010 or newer MacBook Air and the MacBook Pro with Retina display

In my macbook pro 15 inch mid 2012 model, my cpu and gpu will get very hot, when gaming or rendering sometimes over 200F. The fans only spin at max about 2900 rpm, when their max is 6400. I downloaded a fan control app, but how can i fix it?

In my macbook pro 15 inch mid 2012 model, my cpu and gpu will get very hot, when gaming or rendering sometimes over 200F. The fans only spin at max about 2900 rpm, when their max is 6400. I downloaded a fan control app, but how can i fix it?

Hi rhaughan,
I see that you have concerns about your operating temperature of your computer while using resource-heavy applications such as gaming applications. I have an article that will address some of the concerns you have mentioned:
Mac notebooks: Operating temperature - Apple Support
http://support.apple.com/en-is/HT201640
While there are third-party utilities that measure the temperature of a notebook computer, it is important to understand that these utilities are not measuring the external case temperature. The actual case temperature is much lower. Never use third-party applications to diagnose possible hardware issues—instead, contact Apple or go to an Apple Retail Store or Apple Authorized Service Provider.
You should also see this article for even further information about your fans:
Learn about the fans in your Mac - Apple Support
http://support.apple.com/en-is/HT202179
Thanks for being a part of the Apple Support Communities!
Cheers,
Braden

After sleeping my macbook pro 15.4" mid 2012 model for overnight and pass 24 hours time, on wake -- the dock background is white for a few seconds and then it turns back to normal color. . .

After sleeping MacBook Pro 15.4" mid 2012 model (running Mac OS X 10.10.2 Yosemite) for overnight and pass 24 hours time, upon wake from sleep-- the dock background is white for a few seconds and then it turns back to the normal color.
Is this normal? Should I be worried? Is my GPU defective?
My specs:
MacBook Pro 15.4" Mid 2012 model, Ivy Bridge Quad core i7 2.3Ghz CPU w/ hyperthreading,
16GB RAM, Nvidia 650M 512MB VRAM/Intel 4000 HD 1GB VRAM, 500GB HD
Running Mac OSX 10.10.2 Yosemite.
Thanks to all in advanced.

It doesn't happen all the time but sometimes and i tried zapping the PRAM and it still happens!

I have a macbook pro 15 inch mid 2012 and I want to change the hard drive, what specifications do I need to search for?

I have a macbook pro 15 inch mid 2012 and I want to change the hard drive, what specifications do I need to search for?

Does a Seagate - 1TB Internal Serial ATA III/Serial ATA II Solid State Hybrid Drive for Laptops - Multi with the following specifications may work??
Height
4 inches
Width
2.75 inches
Weight
3.5 ounces
Color Category
Multi
Minimum System Requirements
PC: Windows XP, Vista, 7 or 8; MacBook®, MacBook Pro or Mac Mini: Intel®
processor; OS X; Linux; internal Serial ATA III or Serial ATA II support

Duo Displays Problem on MacBook Pro (13-inch, Mid 2012) Resolution 2560x1440 and 1280x800, Sometime 2560x1440 is blank screen and must restart to fixed it

Dear all,
I found some problems for using Duo Displays with MacBook Pro (13-inch, Mid 2012) display and Samsung UHD Display (U28D590). I use resolution on my macbook is 1280x800, Samsung UHD Display is 2560x1440 And Connect with Display port to mini display port.
But I use sometime found always blank screen on Samsung Display and I tried to unplug mini display port and plug it again but it is not working until I shutdown and restart my macbook pro, my display back to working.
I want to fix this problem because it is very trouble for my working a lot.
Thank you very much
Phot

The symptoms I'm getting now, and I'm not sure if they're any different, suggest that for some reason Mountain Lion thinks my display resolution is higher than what it is, as wether I'm turning AirPlay on or off, it keeps changing it (on the MacBook) to what looks like maybe 1080p.

MacBook Pro (13-inch, Mid 2012) OS X 10.9.4 (13E28) Suddenly SLOW

Hi All,
Out of nowhere, my MacBook Pro (13-inch, Mid 2012) OS X 10.9.4 (13E28) has slowed down to the pace of a snail.
NEED HELP!!!
EtreCheck version: 1.9.15 (52)
Report generated September 15, 2014 at 23:15:16 240GMT+1
Hardware Information: ?
MacBook Pro (13-inch, Mid 2012) (Verified)
MacBook Pro - model: MacBookPro9,2
1 2.5 GHz Intel Core i5 CPU: 2 cores
8 GB RAM
Video Information: ?
Intel HD Graphics 4000 - VRAM: (null)
Color LCD 1280 x 800
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 0 days 0:11:19
Disk Information: ?
APPLE HDD TOSHIBA MK5065GSXF disk0 : (500.11 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 499.25 GB (262.78 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
MATSHITADVD-R   UJ-8A8
USB Information: ?
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ?
Apple Inc. thunderbolt_bus
Configuration files: ?
/etc/sysctl.conf - Exists
/etc/hosts - Count: 57
Gatekeeper: ?
Mac App Store and identified developers
Kernel Extensions: ?
[not loaded] at.obdev.nke.LittleSnitch (3883 - SDK 10.8) Support
Launch Daemons: ?
[running] com.adobe.ARM.[...].plist Support
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.adobe.SwitchBoard.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
[loaded] com.oracle.java.JavaUpdateHelper.plist Support
Launch Agents: ?
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.divx.dms.agent.plist Support
[loaded] com.divx.update.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
User Launch Agents: ?
[loaded] com.adobe.ARM.[...].plist Support
User Login Items: ?
iTunesHelper
AdobeResourceSynchronizer
Internet Plug-ins: ?
OVSHelper: Version: 1.1 Support
Default Browser: Version: 537 - SDK 10.9
Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 Support
AdobePDFViewerNPAPI: Version: 11.0.07 - SDK 10.6 Support
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
DivX Web Player: Version: 3.2.1.977 - SDK 10.6 Support
Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
SharePointBrowserPlugin: Version: 14.4.3 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.07 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 7 Update 65 Check version
Safari Extensions: ?
AdBlock-2
Social Fixer-2
Audio Plug-ins: ?
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
InstantOn: Version: 7.1.2 - SDK 10.8 Support
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins ?
CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
3rd Party Preference Panes: ?
Flash Player Support
Flip4Mac WMV Support
Java Support
Perian Support
Time Machine: ?
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Volumes being backed up:
Macintosh HD: Disk size: 464.96 GB Disk used: 220.23 GB
Destinations:
INDIGO | 3TB [Local] (Last used)
Total size: 3 TB
Total number of backups: 6
Oldest backup: 2013-09-07 14:25:04 +0000
Last backup: 2014-08-05 15:01:54 +0000
Size of backup disk: Excellent
Backup size 3 TB > (Disk size 464.96 GB X 3)
Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU: ?
      3% WindowServer
      2% hidd
      0% librariand
      0% ubd
      0% mds_stores
Top Processes by Memory: ?
164 MB mds_stores
164 MB Safari
98 MB com.apple.IconServicesAgent
49 MB ocspd
49 MB Dock
Virtual Memory Information: ?
5.71 GB Free RAM
1.36 GB Active RAM
256 MB Inactive RAM
703 MB Wired RAM
265 MB Page-ins
0 B Page-outs

If this started happening without your having made any changes and without a warning of low disk space, then it's likely that the startup drive, or some other hardware component, is failing. Back up all data immediately, then make a "Genius" appointment at an Apple Store to have the machine tested.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.

What internal hard drive is compatible with Macbook Pro (13-inch, Mid 2012)?

I live in India. I have a MacBook Pro (13-inch, Mid 2012). My Macbook crashed 3 days ago. Apple said the internal hard disk needed replacement. They gave me two options.
1. They get a new hard drive replaced from Apple for 12000 INR (280$),
or 2. If you find it expensive, you can buy an internal hard disk from sources other than Apple and we will fix it in for you.
I have decided to go with option 2, because option 1. is not feasible for me!
Now my question is,
What type of internal hard disk should I buy?
or
What are the specifications for the internal hard drive that must be met to suit my MBP?
Getting my internal hard disk replaced is something I've never done before.
I have a MBP, (13-inch, Mid 2012 model)

Here you go:
http://www.ebay.com/itm/Toshiba-1TB-MQ01ABD100-HDKBB96A1A01-2-5-5400RPM-Laptop-N otebook-9-5mm-HDD-/171120091488?pt=US_Internal_Hard_Disk_Drives&hash=item27d78d6 160
Or same on amazon.com
Ive installed same on several 2012 Macbook Pro, same HD as used by Apple themselves

Just upgraded to Yosemite 10.10.3 including Photos 1.0 which is not syncing with Adobe Photoshop Elements 12 Editor (already installed)....any ideas? Using MacBook Pro (13-inch Mid 2012)

Just upgraded my MacBook Pro (13-inch Mid 2012) to Yosemite 10.10.3 including Photos 1.0 which is not syncing with Adobe Photoshop Elements 12 Editor (already installed and prev ok with iPhoto)....any ideas please?

In iPhoto it was possible to go into the iPhoto prefs and set up Elements as an external editor. After using “Edit in” the image was saved back to the iPhoto library. Photos for OSX is very new, so I’m not sure whether that is possible with the new app. Have you looked for the prefs/settings? You could ask a question on the Apple forum:
https://support.apple.com/en-us/HT204655

MacBook Pro Retina 15" mid-2012 won't boot in clamshell mode with an external display attached

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