MacBook Pro will not finsih booting up after Yosemite upgrade

I upgraded my 2013 MacBook Pro to Yosemite last night, but I encountered a problem when I tried booting up this morning. Whenever I turn my MacBook on, the progress bar slowly begins to load, and then it disappears and I see a grey circle with a slash through it, like a "not allowed" sign. Is there any way I can fix this? Please let me know. Thanks!

Hi Crystalmirror,
Welcome to the Apple Support Communities!
I understand that it can be both frustrating and concerning when your computer will not startup as expected. In this situation I would recommend working through the troubleshooting steps in the attached article to help resolve the issue.
Mac OS X: Gray screen appears during startup - Apple Support
Best regards,
Joe

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Hi, i have a first generation Macbook Pro. As i was browsing the web, my computer all the sudden froze and the "grey screen of death" appeared and shut of my computer. After, it tried to restart, but it wont get past the CD rom or hard drive noise it makes once you press the power button. I hear the noise fully cycle once, then it restarts the noise and keeps skipping. Once its done, the computer IS on, but the screen is black and I cannot do anything. Please help! Ive never dealt with thins kind of problem and Im sort of a noob with computers. Is the computer fried? It is after all 7 years old, and I use it daily.

After the startup sound (be precise) after the sound press the shift Key until the apple appear.
If that wont work. Try an SMC reset
Then try a PRAM reset
This procedures are on apple webpage

MacBook Pro does not start up properly after yosemite, I see a black screen. What to do?

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Ihave a early 2011 Macbook Pro 13 and ever since downloading Yosemite from Mavericks my computer speed decreased significantly for every function. I moved over all huge image and music files and still just little progress. So ran report on EtreCheck:
Please help me out!
Problem description:
Extremely Slow after downloading Yosemite from Mavericks
EtreCheck version: 2.0.11 (98)
Report generated November 14, 2014 at 10:31:31 PM PST
Hardware Information: ℹ️
MacBook Pro (13-inch, Early 2011) (Verified)
MacBook Pro - model: MacBookPro8,1
1 2.3 GHz Intel Core i5 CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1333 MHz ok
BANK 1/DIMM0
2 GB DDR3 1333 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 3000 - VRAM: 384 MB
Color LCD 1280 x 800
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 0:29:28
Disk Information: ℹ️
TOSHIBA MK3265GSXF disk0 : (320.07 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / [Startup]: 318.84 GB (145.87 GB free)
Core Storage: disk0s2 319.21 GB Online
MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM2070 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/System/Library/Extensions
[not loaded] com.seagate.driver.PowSecDriverCore (5.2.6 - SDK 10.4) Support
/System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.2.6 - SDK 10.4) Support
[not loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.2.6 - SDK 10.5) Support
[not loaded] com.seagate.driver.SeagateDriveIcons (5.2.6 - SDK 10.4) Support
Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[loaded] com.google.keystone.daemon.plist Support
[loaded] com.microsoft.office.licensing.helper.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist Support
[loaded] com.facebook.videochat.[redacted].plist Support
User Login Items: ℹ️
iTunesHelper UNKNOWN (missing value)
Canon IJ Network Scanner Selector2 ApplicationHidden (/Library/Printers/Canon/IJScanner/Utilities/Canon IJ Network Scanner Selector2.app)
uTorrent UNKNOWN (missing value)
Genieo UNKNOWN (missing value)
TuneupMyMac UNKNOWN (missing value)
Internet Plug-ins: ℹ️
o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 2.4.0.11 Support
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 Support
Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
Flash Player: Version: 15.0.0.223 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
EPPEX Plugin: Version: 3.0.5.0 Support
JavaAppletPlugin: Version: Java 7 Update 45 Check version
Safari Extensions: ℹ️
FastestTube
Omnibar
3rd Party Preference Panes: ℹ️
Flash Player Support
Flip4Mac WMV Support
Java Support
Paragon NTFS for Mac ® OS X Support
Time Machine: ℹ️
Skip System Files: NO
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 318.84 GB Disk used: 172.97 GB
Destinations:
MAC [Local]
Total size: 1.00 TB
Total number of backups: 22
Oldest backup: 2013-01-29 11:16:13 +0000
Last backup: 2014-09-18 17:35:05 +0000
Size of backup disk: Excellent
Backup size 1.00 TB > (Disk size 318.84 GB X 3)
Top Processes by CPU: ℹ️
      6% WindowServer
      0% fontd
      0% AppleSpell
      0% askpermissiond
Top Processes by Memory: ℹ️
189 MB Finder
176 MB com.apple.WebKit.WebContent
133 MB mds_stores
112 MB Safari
77 MB WindowServer
Virtual Memory Information: ℹ️
561 MB Free RAM
1.71 GB Active RAM
915 MB Inactive RAM
1.10 GB Wired RAM
1.42 GB Page-ins
29 KB Page-outs

Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
     Boot to the Recovery HD: Restart the computer and after the chime press and hold down the
     COMMAND and R keys until the Utilities 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.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
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5. Reinstall Yosemite from Scratch:
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
How to Clean Install OS X Yosemite
Note: You will need an active Internet connection. I suggest using Ethernet if possible
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Macbook Pro heating up and draining battery after yosemite upgrade.

On Friday, I upgraded to Yosemite and I really like it. However my computer keeps heating up very quickly when doing simple tasks and the battery also drains. About 1% every 2 minutes when on Safari and having Pages open in the background. What can I do to slow down the battery drain. Before, on Mavericks I could get a whole day on Safari but now about half a day.
This is the report that I got from EtreCheck.
EtreCheck version: 2.0.6 (91)
Report generated 22 October 2557 BE 10:58:23 am AEST
Hardware Information: ℹ️
MacBook Pro (13-inch, Mid 2012) (Verified)
MacBook Pro - model: MacBookPro9,2
1 2.5 GHz Intel Core i5 CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR3 1600 MHz ok
BANK 1/DIMM0
2 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
Intel HD Graphics 4000 -
Color LCD 1280 x 800
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 2:20:32
Disk Information: ℹ️
APPLE HDD HTS547550A9E384 disk0 : (500.11 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
QACI HD (disk0s2) / [Startup]: 419.25 GB (222.26 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
BOOTCAMP (disk0s4) /Volumes/BOOTCAMP : 80.00 GB (56.65 GB free)
HL-DT-ST DVDRW GS31N
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. Apple Internal Keyboard / Trackpad
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Configuration files: ℹ️
/etc/sysctl.conf - Exists
Gatekeeper: ℹ️
Anywhere
Kernel Extensions: ℹ️
/System/Library/Extensions
[not loaded] com.devguru.driver.SamsungComposite (1.4.18 - SDK 10.6) Support
[not loaded] com.digidesign.fwfamily.driver (8.0.5f2) Support
[loaded] com.digidesign.iokit.DigiDal (8.0.5f2) Support
[loaded] com.digidesign.iokit.DigiIO (8.0.5f2) Support
[not loaded] com.digidesign.mbox2.boot.driver (8.0.5f2) Support
[not loaded] com.digidesign.mbox2.driver (8.0.5f2) Support
[not loaded] com.digidesign.usb.elevenrack.driver (1.0.1) Support
[not loaded] com.libusb.USB_Shield (6.0) Support
[not loaded] com.paceap.kext.pacesupport.master (5.7.2) Support
[not loaded] com.wacom.kext.pentablet (5.2.6) Support
[not loaded] com.wacom.kext.wacomtablet (6.3.3) Support
/System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
[not loaded] com.paceap.kext.pacesupport.leopard (5.7.2) Support
[not loaded] com.paceap.kext.pacesupport.panther (5.7.2) Support
[loaded] com.paceap.kext.pacesupport.snowleopard (5.7.2) Support
[not loaded] com.paceap.kext.pacesupport.tiger (5.7.2) Support
/System/Library/Extensions/ssuddrv.kext/Contents/PlugIns
[not loaded] com.devguru.driver.SamsungACMControl (1.4.18 - SDK 10.6) Support
[not loaded] com.devguru.driver.SamsungACMData (1.4.18 - SDK 10.6) Support
[not loaded] com.devguru.driver.SamsungMTP (1.4.18 - SDK 10.5) Support
[not loaded] com.devguru.driver.SamsungSerial (1.4.18 - SDK 10.6) Support
Startup Items: ℹ️
Digidesign Mbox 2: Path: /Library/StartupItems/Digidesign Mbox 2
DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader
PACESupport: Path: /Library/StartupItems/PACESupport
Startup items are obsolete and will not work in future versions of OS X
Launch Agents: ℹ️
[not loaded] com.adobe.AAM.Updater-1.0.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
[running] com.wacom.pentablet.plist Support
[running] com.wacom.wacomtablet.plist Support
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist Support
[invalid?] com.adobe.SwitchBoard.plist Support
[invalid?] com.bombich.ccc.plist Support
[loaded] com.chasingsilver.dpprivilegedhelper.plist Support
[running] com.digidesign.elevenrack.helper.plist Support
[running] com.digidesign.fwfamily.helper.plist Support
[loaded] com.macpaw.CleanMyMac2.Agent.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
[loaded] PACESupport.plist Support
User Launch Agents: ℹ️
[invalid?] com.adobe.ARM.[...].plist Support
[loaded] com.google.keystone.agent.plist Support
[invalid?] com.spotify.webhelper.plist Support
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Wunderlist Application (/Applications/Wunderlist.app)
Internet Plug-ins: ℹ️
DirectorShockwave: Version: 11.6.6r636 Support
WacomNetscape: Version: 1.1.1-1 Support
Unity Web Player: Version: UnityPlayer version 4.3.7f1 - SDK 10.6 Support
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 Support
WacomTabletPlugin: Version: WacomTabletPlugin 2.1.0.2 Support
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
FlashPlayer-10.6: Version: 15.0.0.152 - SDK 10.6 Support
Silverlight: Version: 5.1.10411.0 - SDK 10.6 Support
Flash Player: Version: 15.0.0.152 - SDK 10.6 Mismatch! Adobe recommends 15.0.0.189
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0 - SDK 10.8
SharePointBrowserPlugin: Version: 14.1.0 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 7 Update 67 Check version
Safari Extensions: ℹ️
AdBlock
Audio Plug-ins: ℹ️
Digidesign CoreAudio: Version: 8.0.5 Support
3rd Party Preference Panes: ℹ️
Digidesign Eleven Rack Support
DigidesignMbox2 Support
Digidesign Mbox 2 Pro Support
Flash Player Support
Flip4Mac WMV Support
Java Support
Perian Support
Time Machine: ℹ️
Skip System Files: NO
Auto backup: YES
Destinations:
LaCie [Local]
Total size: 1 TB
Total number of backups: 45
Oldest backup: 2013-11-17 01:31:45 +0000
Last backup: 2014-10-21 11:52:49 +0000
Size of backup disk: Excellent
Backup size 1 TB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
      6% WindowServer
      2% Safari
      2% hidd
      1% com.apple.WebKit.Networking
      1% BezelUIServer
Top Processes by Memory: ℹ️
185 MB Safari
176 MB Pages
132 MB mds_stores
82 MB ocspd
69 MB Wunderlist
Virtual Memory Information: ℹ️
193 MB Free RAM
1.89 GB Active RAM
1.32 GB Inactive RAM
832 MB Wired RAM
2.60 GB Page-ins
70 MB Page-outs

Nothing obvious here, but better get rid of that remnant of CleanMyMac2. Also check if all software with kernel extensions, launch agents and launch daemons is still necessary and up to date (if not uninstall or update).

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How do I uninstall Yosemite please ? Since I upgraded my 2011 MacBook Pro will not boot up

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You can't downgrade or uninstall unless you first erase the drive. Try the following:
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Also see:
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Note: You will need an active Internet connection. I suggest using Ethernet
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The internal HDD will have to be replaced. Since you cannot get the MBP to acces the internal HDD, you will have either use Target Disk Mode:
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Ciao.

Macbook pro will not boot even to grey screen ??

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More information from you will assist us trying to help you.

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My Macbook Pro will not boot-up or get beyond the grey screen (with spinning gear wheel.) I've tried all the recommended actions: resetting PRAM, disk repair, permissions repair, re-boot in safe mode etc but still the problem persists. When viewing the safe-boot in verbose mode, the system seems to hang at the stage when it's checking the Airport & Ethernet - the last line on the page reads: "AppleBCOM5701Ethernet: 0 0 setFixedSpeed - logic error, speed any?"
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