13" macbook pro retina 2013 problem: blank screen when waking up from standby

I bought a 13" macbook pro retina 2013 about 3 months ago and it is for about a week or two that I encountered a problem: when I close the lid and open it after a while(or it goes to standby by not using it for some time and then I wake it up by pressing a button), sometimes it shows a blank dark screen(with mouse cursor) for about 15 seconds and then either the screen is turned off(and by pressing a key it shows the login screen) or it shows the normal login screen.

I also have this problem, and now the
NVIDIA GeForce GT 650M is not working at all
I use gfxCardStatus for work on integrated card and i can't use other displays obviously, because all video outputs (HDMI & Thunderbolt) are taking their ways from discrete card (but working on other displays is my profession of audiovisual artist). My world guarranty is over now, new motherboard costs near 1500 $ and now i don't want what to do.Maybe reballing of videochip will help me, but i'm afraid that not autorised service in my country will kill my motherboard at all. This is my first mac & i have lost many time for take the money for buyng it. I have so much frustration.

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2012 macbook pro retina display artifacts on screen when using onboard video

2012 Macbook Pro Retina Display artifacts on screen when using onboard video.
About a month ago I've noticed these strange artifacts (blocky pixelated looking) running vertically down the screen. It first started when using Safari. Then it started to happen all the time. I turned off the auto switch video in preferences, which I'm assuming forces the computer to use the separate video card and the artifacts go away.
On top of that issue I also have had the ghosting issue.
Anyone else have this problem?

artifacts onscreen could mean a faulty gpu. You said by forcing it on inbuilt gpu you do not find this issue highlights that. Do take it in to apple for service and also tell them of your ghosting issue.
There are a few retina owners who have faulty gpus.

Macbook pro tries to connect bluetooth keyboard when waking up from sleep

I have a 2012 Macbook pro and it is trying to connect to a bluetooth keyboard when I wake it up from sleep. The computer freezes while it is searching for the keyboard and only works properly once it discovers there is no keyboard connected. I have never used a bluetooth keyboard and I currently have my bluetooth switched off.
Doe anyone have any idea how I might stop this from happening? It can often freeze for quite a while, which can be very frustrating.

I have the exact same issue. MacBook Pro Mid 2012. OSX Yosemite 10.10.2. Mine is actually brand new.

My Macbook Pro Retina is having kernel panics when woken up from sleep mode

I want to say this started when I began hooking up my laptop to an old 23" monitor from 2005 (aluminum matte screen version). Here's the error message I get...
Interval Since Last Panic Report: 7280 sec
Panics Since Last Report:          5
Anonymous UUID:                    C1C6E455-6ED8-2511-735A-54F896291CDF
Wed Feb 13 08:06:23 2013
panic(cpu 2 caller 0xffffff802aeb7e75): Kernel trap at 0xffffff7fab3b9816, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x000000002d97b000, CR4: 0x00000000001606e0
RAX: 0xffffff804020a100, RBX: 0xffffff80fe635000, RCX: 0x0000000000000002, RDX: 0x0000000000000004
RSP: 0xffffff811c6abdc0, RBP: 0xffffff811c6abde0, RSI: 0x0000000000000002, RDI: 0x0000000000000000
R8: 0xffffff8040209000, R9: 0x00000000000003ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
R12: 0xffffff80401db500, R13: 0x0000000000000002, R14: 0x0000000000000004, R15: 0x0000000000000002
RFL: 0x0000000000010246, RIP: 0xffffff7fab3b9816, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0x0000000000000000, Error code: 0x0000000000000000, Fault CPU: 0x2
Backtrace (CPU 2), Frame : Return Address
0xffffff811c6aba60 : 0xffffff802ae1d626
0xffffff811c6abad0 : 0xffffff802aeb7e75
0xffffff811c6abca0 : 0xffffff802aecd3bd
0xffffff811c6abcc0 : 0xffffff7fab3b9816
0xffffff811c6abde0 : 0xffffff802b2388cc
0xffffff811c6abe30 : 0xffffff802b2352e1
0xffffff811c6abe80 : 0xffffff802b23f804
0xffffff811c6abec0 : 0xffffff802b234b8b
0xffffff811c6abef0 : 0xffffff802b23f4fd
0xffffff811c6abf30 : 0xffffff802b2451ea
0xffffff811c6abf80 : 0xffffff802b245319
0xffffff811c6abfb0 : 0xffffff802aeb2957
      Kernel Extensions in backtrace:
         com.apple.iokit.IOUSBFamily(5.5)[DF1A9F7E-C593-313D-8EBB-5DA72F03C087]@0xffffff 7fab399000->0xffffff7fab3f4fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.3)[7EECA562-F708-37FF-9757-CA9C98939903]@0xffff ff7fab370000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
12C3103
Kernel version:
Darwin Kernel Version 12.2.1: Thu Oct 18 12:13:47 PDT 2012; root:xnu-2050.20.9~1/RELEASE_X86_64
Kernel UUID: 3F93B852-872F-3DF0-BCF8-46D48024C422
Kernel slide:     0x000000002ac00000
Kernel text base: 0xffffff802ae00000
System model name: MacBookPro10,1 (Mac-C3EC7CD22292981F)
System uptime in nanoseconds: 1925190311437
last loaded kext at 244150815221: com.apple.filesystems.msdosfs          1.8 (addr 0xffffff7fad2c6000, size 65536)
last unloaded kext at 304279626761: com.apple.filesystems.msdosfs          1.8 (addr 0xffffff7fad2c6000, size 57344)
loaded kexts:
org.virtualbox.kext.VBoxNetAdp          4.2.6
org.virtualbox.kext.VBoxNetFlt          4.2.6
org.virtualbox.kext.VBoxUSB          4.2.6
org.virtualbox.kext.VBoxDrv          4.2.6
com.silex.driver.sxuptp          1.10.0
at.obdev.nke.LittleSnitch          3894
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AudioAUUC          1.60
com.apple.iokit.IOBluetoothSerialManager          4.1.2f9
com.apple.filesystems.autofs          3.0
com.apple.driver.AGPM          100.12.81
com.apple.driver.ApplePlatformEnabler          2.0.6d1
com.apple.driver.X86PlatformShim          1.0.0
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.3.5fc12
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.GeForce          8.0.6
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleMikeyDriver          2.3.5fc12
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.2f9
com.apple.driver.AppleIntelHD4000Graphics          8.0.6
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleSMCPDRC          1.0.0
com.apple.driver.AppleSMCLMU          2.0.3d0
com.apple.driver.AppleMCCSControl          1.1.11
com.apple.driver.AppleIntelFramebufferCapri          8.0.6
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.AppleMuxControl          3.2.13
com.apple.driver.ApplePolicyControl          3.2.13
com.apple.driver.AppleUSBTCButtons          237.1
com.apple.driver.AppleUSBTCKeyboard          237.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.3.1
com.apple.driver.AppleUSBHub          5.5.0
com.apple.driver.AppleSDXC          1.4.0
com.apple.driver.AirPort.Brcm4331          612.20.15
com.apple.driver.AppleAHCIPort          2.5.1
com.apple.driver.AppleUSBEHCI          5.5.0
com.apple.driver.AppleUSBXHCI          1.5.1
com.apple.driver.AppleEFINVRAM          1.7
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleACPIButtons          1.7
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.7
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.driver.AppleBluetoothHIDKeyboard          170.2
com.apple.driver.AppleHIDKeyboard          170.2
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.kext.triggers          1.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
com.apple.driver.DspFuncLib          2.3.5fc12
com.apple.iokit.IOAudioFamily          1.8.9fc11
com.apple.kext.OSvKernDSPLib          1.6
com.apple.nvidia.nvGK100hal          8.0.6
com.apple.NVDAResman          8.0.6
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.2f9
com.apple.iokit.IOSurface          86.0.3
com.apple.driver.X86PlatformPlugin          1.0.0
com.apple.driver.AppleHDAController          2.3.5fc12
com.apple.iokit.IOHDAFamily          2.3.5fc12
com.apple.driver.AppleSMBusController          1.0.11d0
com.apple.driver.AppleSMC          3.1.4d2
com.apple.driver.AppleSMBusPCI          1.0.11d0
com.apple.driver.IOPlatformPluginFamily          5.3.0d47
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleGraphicsControl          3.2.13
com.apple.iokit.IONDRVSupport          2.3.6
com.apple.iokit.IOGraphicsFamily          2.3.6
com.apple.driver.AppleThunderboltDPInAdapter          1.8.9
com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.9
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.6
com.apple.driver.AppleUSBMultitouch          237.3
com.apple.driver.IOBluetoothHIDDriver          4.1.2f9
com.apple.iokit.IOBluetoothFamily          4.1.2f9
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.driver.AppleUSBMergeNub          5.5.0
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.driver.AppleThunderboltNHI          1.6.3
com.apple.iokit.IOThunderboltFamily          2.1.8
com.apple.iokit.IO80211Family          510.4
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOUSBUserClient          5.5.0
com.apple.iokit.IOAHCIFamily          2.3.1
com.apple.iokit.IOUSBFamily          5.5.0
com.apple.driver.AppleEFIRuntime          1.7
com.apple.iokit.IOHIDFamily          1.8.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          344
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.7
com.apple.iokit.IOPCIFamily          2.7.3
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: MacBookPro10,1, BootROM MBP101.00EE.B02, 4 processors, Intel Core i7, 2.6 GHz, 8 GB, SMC 2.3f32
Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In, 512 MB
Graphics: NVIDIA GeForce GT 650M, NVIDIA GeForce GT 650M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54333531533642465238432D50422020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xEF), Broadcom BCM43xx 1.0 (5.106.98.100.15)
Bluetooth: Version 4.1.2f9 11046, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SD512E, 500.28 GB
USB Device: hub_device, 0x8087 (Intel Corporation), 0x0024, 0x1a100000 / 2
USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8510, 0x1a110000 / 3
USB Device: hub_device, 0x8087 (Intel Corporation), 0x0024, 0x1d100000 / 2
USB Device: hub_device, 0x0424 (SMSC), 0x2512, 0x1d180000 / 3
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0262, 0x1d182000 / 5
USB Device: BRCM20702 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x1d181000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8286, 0x1d181300 / 6
Thanks for the help in advance!

Any or all of the following third-party system modifications may be contributing to your problem:
VirtualBox
SX-Virtual Link
Little Snitch
If the panic is recurrent, I suggest you uninstall them, one at a time, according to the developers' instructions, to see whether you can identify which one is at fault. A conflict between modifications may be involved. Reboot and test after each uninstallation.
Back up all data before making any changes.

Hello, I have a Macbook pro retina-2013. About Mavericks I could set my 4K monitor via HDMI on 2560x1440. This I can not get through at Yosemite. Can someone help me there?

Hello, I have a macbook pro retina-2013.
About Mavericks I could set my 4K monitor via HDMI on 2560x1440.
This I can not get through at Yosemite. Can someone help me there?

They really pushed that it would all work great! Has anyone had the same struggle? Are there any step-by-step instructions to get linked up?
Call Verizon's wireless tech support & explain your problem to them. They will provide "step-by-step" instructions over the phone.
Take notes too!
TIP: If you do call & don't want to go through all those darn promps, when you initially call, just don't say anything. The automatic voice will then say, "will connect you to a service rep."

Hello, I have a Macbook pro retina-2013. About Mavericks I could set my 4K monitor via HDMI on 2560x1440. This I can not set at Yosemite. Can someone help me there?

Hello, I have a Macbook pro retina-2013. About Mavericks I could set my 4K monitor via HDMI on 2560x1440. This I can not set at Yosemite. Can someone help me there?

They really pushed that it would all work great! Has anyone had the same struggle? Are there any step-by-step instructions to get linked up?
Call Verizon's wireless tech support & explain your problem to them. They will provide "step-by-step" instructions over the phone.
Take notes too!
TIP: If you do call & don't want to go through all those darn promps, when you initially call, just don't say anything. The automatic voice will then say, "will connect you to a service rep."

MacBook Pro retina 2013 do not start and no light on the magsafe

Hello
I have a MacBook Pro Retina 2013 13' core i5 2.5 8gb ram
My mac was open, connect to the sector with full power. I left it the time to lunch and when i came back maybe 2 hours after my mac was off, and no light on the magsafe.
Impossible to start it.
I tried the key sequence, nothing worked.
I used the magsafe of a friend who have the same model, i had i green light for 10s before it turn slowly off. and nothing worked too.
One of my neighbor on the same building, had the same problem at the same time, computer open (not a mac) and it turn off impossible to start it, he had to disconnect/reconnect the battery to solve the problem.
May it be a power surge?
Did i need to open it and disconnect the battery on the motherboard?
Thank you for your help.

A Few things to try if you haven't already:
1. Try unplugging the charger from both the wall and from your MacBook Pro. Now, make sure the powerpoint the MacBook was connected to works by plugging it in any electrical appliance you have. After unplugging the test electrical appliance and verifying that everything is OK with the electrical source, wait a minute or two and just plug the charger back into your MacBook and the powerpoint.
2. A possible problem could be a MagSafe port not working correctly. Look for any kind of debris inside the port that might prevent it from connecting the power adapter correctly to your MacBook. On the adapter, take a quick look at the DC connector for any type of debris and carefully check if any of the pins are missing, are bent, or stuck down.
3. Try a quick restart. Just press CMD CTRL ALT EJECT For about 5 seconds.
4. Try CMD, CTRL and POWER for about 5 seconds.
5. If none of this works, my last suggestion is removing the battery connecters and power supplies ect and holding the power button for a few seconds and reconnecting everything.

My MacBook Pro retina 2013 won't charge. I've checked all connections which are all ok. Little red light shows on magnetic plug, instead of usual green.

My MacBook Pro retina 2013 won't charge. I've checked all connections which are all ok. Little red light shows on magnetic plug, instead of usual green.

If you are seeing a Red LED, you may have a faulty MagSafe Adapter.
I remember reading that the orange light is produced by a combination of a Red and Green LED. If that's the case, It seems that the adapter isn't lighting the green LED properly at that time.
I would suggest you seek service with your nearest Genius Bar (Apple Retail Store) or Apple Authorised Service Provider as they have access to diagnostics which may assist in isolating any hardware issues you may be experiencing.
Cheers.

MacBook Pro Retina (2013) and Photoshop Elements 12 or Lightroom 5?

I have moved to a new MacBook Pro Retina (2013) from my old Windows 7 PC. As an amateur photographer which is better - Photoshop Elements 12 or Lightroom 5?

Lightroom is already optimized for the retina display and PSE12 looks superb on the Macbook pro R. You are never going to get a retina display much larger than 15 inches but once tried you would never wish to go back to other monitors. It’s not just photos; all Apple apps on the MBPr including web browsing are optimized.
Large monitors can be great if you are soft proofing images for print enlargements or for editing and rendering video where the extra real estate is useful. So it comes down to need. In general, images appear sharper on smaller displays. I upload most of my photos to my own website and Google Analytics tells me that a high proportion of my visitors are increasingly viewing on iPads, tablets and smartphones. For me that makes the MBPr ideal for my photo editing. It has far superior clarity compared with the excellent 27 inch Dell Ultra Sharp monitor on my desktop machine.
The only caveat is that nobody really knows the life of flash storage. Some say four years when writing continuously to the SSD drive and less once you start moving from unused space to overwriting. For that reason I always try to write to an external hard drive or SDXC card; reserving the SSD, as far as possible for running the applications.
I think we are getting a bit off-topic as the OP already has the MBPr and only needs to decide between PSE & LR or both.

MacBook Pro Retina 2013 stuck on boot every time after iPhone 5S is connected to it.

I have a MacBook Pro Retina 2013 and I've noticed that every single time I connect the iPhone 5S to it at the next boot the Mac hangs.
Booting in Safe Mode will eventually work (after about 20 minutes).
I can reproduce this every single time with this combination. Any advice?

You can try resetting the PRAM and SMC, but both of your devices are new. You can just make a Genius Bar appointment and let them figure it out.
SMC
http://support.apple.com/kb/ht3964
PRAM
http://support.apple.com/kb/PH14222

MacBook Pro Retina 2013 15" 2.8Ghz i7 OVERHEATING

Hi,
I have MacBook Pro Retina 2013 15" 2.8Ghz i7
I use istat fan is set to max about 5500rpm. Temperature in idle ( clean reinstall just with istat menus, chrome, geekbech ) is about 80C when I try run geekbench temperature is about 105-110C so is very hot.
Thanks for advice.
If I take to Apple Store can help my there ?

Hello MarkKiss
Check out the article below about the operating temperature for your MacBook Pro. If you are still concerned, there are links within the article for further assistance.
Mac notebooks: Operating temperature
http://support.apple.com/kb/HT1778
Thanks for using Apple Support Communities.
Regards,
-Norm G.

Canopus ADVC110 to 15" macbook pro retina 2013 Model

Hai All,
How can i connect Canopus ADVC110 to 15" macbook pro retina 2013 Model

Same doubt here,
Theoretically you could use a Thunderbolt to Firewire adapter from Apple.
The remaining question is: will it provide enougth energy to power the ADVC110 unit?

Retina Mac shows gray screen when waking up: what to do besides loosing work?

(see also http://apple.stackexchange.com/questions/96188/retina-mac-shows-gray-screen-when -waking-up )
This is the first time that my Retina MacBook Pro wakes up from sleep with a gray screen. After about 10-20 seconds, the MacBook falls asleep again.
Some points that might be relevant:
The only difference between power adapter and no power adapter is that with power adapter it does not go to sleep again.
The battery is almost full (I closed the lid last night when it was about 90%)
An external monitor was not attached when sleeping it, so I don't think How to fix a Macbook that does not always draw its internal screen after waking from sleep and having unplugged external display while asleep? applies.
I've run gfxCardStatus, almost always in "force integrated mode" (to conserve battery). And normally it wakes up correctly.
I run VMware Fusion 4.
All software is up-to-date and fully patched.
I tried to plugin an HDMI monitor and switch displays with Command-Fn-F1 and Command-Fn-F2, but that did not help (it would not switch displays).Before trying to:
reboot (by force a power off),
reset SMC
and/or reset PRAM/NVRAM
What options do I have that do not loose my work?
sleep-wake retina-macbook-pro battery

Those keys do not reinstall OS X. To do that:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.
COMMAND-OPTION-P-R keys resets the PRAM. OS X keyboard shortcuts.

My MacBook Pro retina restart problem

My MacBook Pro retina display is not starting apple logo with spinning wheel appears no desktop page appears. I tried to shut down manually couple of times but same thing happens.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 8
This step applies only to a pre-2013 Mac Pro tower, not to any other model. A dead logic-board battery can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

When I turn on or restart my Macbook Pro Retina 15", my entire screen flashes completely bright yellow for a few seconds and then it goes to the normal Welcome screen. How do I fix this??

Hi Everyone,
This problem just started today. When I turn on or restart my Macbook Pro Retina 15" (Mid 2012 version), my screen is light gray like normal, and then after a few seconds my entire screen flashes completely bright yellow for a few seconds, and then it goes to the normal Welcome screen (where I choose to login as myself or a guest user). This suddenly started today and has not stopped since. This keeps happening every single time I turn on or restart my computer.
Yesterday I installed all the Mavericks and other updates that were available in the App Store, so I'm wondering if this is related to that since this never happened prior to my doing those updates yesterday. When I first installed the new OS X Mavericks (10.9.3) update, it went through the whole installation process (took about 10 minutes), and then during the installation I got an error message saying that it couldn't verify my iTunes application that was on my laptop, and then my laptop finished installing the updates. Then once my laptop restarted, the App Store "Updates" section said that I had to do the whole OS X Mavericks (10.9.3) and iTunes (Version 11.2) updates all over again. So my laptop did the whole installation again (took about 10 minutes, but this time I didn't get that "iTunes error message" during the installation process).
Now, when I go to the App Store "Updates" section, it says the following under "Updates Installed in the Last 30 days":
-Digital Camera RAW Compatibility Update (Version 5.05) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-OS X Update (Version 10.9.3) installed May 15, 2014
-iTunes (Version 11.2) installed May 15, 2014
-Security Update 2014-002 (Version 1.0) installed April 22, 2014
I'm wondering if this flashing bright yellow screen upon bootup is related to the fact that my laptop installed the OS X Update and the iTunes Update two times each? Or is this new problem totally unrelated? It's just that this problem started a day after these 2 updates were installed twice.
My Macbook Pro Retina 15" (Mid 2012 version) is otherwise working fine at least as of now. The only issue so far is this flashing bright yellow screen every time I turn on or restart my computer.
If anyone could please help me fix this so that my bootup screen doesn't flash completely bright yellow anymore, I would be forever grateful!
Thank you so much for reading this and for any help you can provide.
hope everyone is well,
Elaine

Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process. Since I did that, my MBP boots up just like normal. No flashing yellow screen anymore!!
(Note that I arrived at this solution when I first saw this page: http://support.apple.com/kb/TS2570?viewlocale=en_US)
Let me know if this works for you!
Elaine

13" macbook pro retina 2013 problem: blank screen when waking up from standby

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