Extremely slow boot in my MBP Retina

It used to be few seconds. I have a fresh installation of Mavericks. It takes now 47 sec. For 35 sec there is a grey screen, then Apple logo appears. It's quite horrible. What can be the cause and how to make it working normally :

Start with these two troubleshooting documents:
https://discussions.apple.com/docs/DOC-5282
https://discussions.apple.com/docs/DOC-3521
Ciao.

Similar Messages

Extremely slow boot. How to get rid of white screen in Windows only boot.

Hey guys I have a Windows 7 only MacBookPro 17". 2.8ghz core 2 duo, 4 gig of ram, 7200 rpm 500gb hd(passes s.m.a.r.t. btw)
It boots extremely slow. I turn the computer on and it stays at the white screen for around 20 seconds. Then it moves to Windows 7 and continues to boot from there. I have a video:
http://www.dailymotion.com/video/xc5taaslow-windows-7-boot-on-macbook-protech
In a windows only setting how would I get it to just boot Windows without going threw the white screen? It also gets hung when logging in on a black screen.
There was a post on Ubuntu forums about Ubuntu only boots about doing something to get it to only boot the MBR. I didn't really understand if this would work with Windows 7 though. Thanks for any help.

I shut down all but one of the extensions, and that seems to have resolved the problem. Thank you!
Now to figure out which extensions I need, and which I don't, because I don't have a clue. I don't remember installing most of these, I only recall one or two (nothing looks spammy like funmoods, but still don't remember when or why these were added...)

S400u extremely slow booting

Recently, my Lenovo S400U started booting extremely slow (takes about 5 minutes to load up to login screen). Same goes with restarting/shutting down, it takes good 5 minutes until the power button stops lighting. Problem is that I've tried a fresh install and it didn't solve the problem. I also tried HD tune, Seagate SeaTools, chkdsk, WD Lifeguard diagnostics - no problems found.
My warranty is ending in March, but I can't afford not having it for a month or so because of studying and work, so I'd like it to get solved other way.
Any ideas of what should I do?

devler,
Welcome to Lenovo Forums !
Thank you for taking time to post in your inquiry. I can see that you are having issues with your Lenovo IdeaPad S400u. If your computer boots slow, Please try this solution.
Solution :
1. Please try checking this Control Panel > Uninstall a program > Look for Express cache
2. If you found one
3. You need to uninstall it.
4. restart your computer and check the Boot speed.
If you did not find Expresscache or the Boot speed did not change
Try installing expresscache from this link.
And check the boot performance.
I hope that this Solution will be the fix for it
Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

Sudden Onset of Extremely Slow Boot Up + Clicking Noise

I have an HP Pavilion Slimline s3400z. I shut the computer down as usual at night and when I went to boot up in the morning, the cpu started making a clicking noise, something like a slow-moving metronome. It took upwards of 4 hours to boot. I manually powered off the computer and restarted it in safe mode. After leaving it to boot overnight, I returned to find that the clicking noise had ceased and the computer seemed to function normally. I restarted the computer in 'normal mode' whereupon the clicking noise resumed and once again it has taken hours for the computer to boot. I have had the computer for a little less than two years and up until today it has worked great.
Other observations that may be of some relevance:
-OS = Vista
-the hard drive light flickers as it normally does
-I can open up programs, although they run extremely slow
-the only error message I have received occurred when I hit alt+ctrl+delete; it said something like "logon security option failed." I clicked ok and haven't seen another error message
I don't know if this is related to the Seagate issues (I can't tell if I have a Seagate hard drive or not) or something else. Please advise if there is anything that I can do to save the computer. Thanks.

Sounds like the hard drive is dying a slow death. I suggest to replace it soon, hope you have a Recovery Disk set? You should be able to replace the hdd fairly easily. Usually a couple of screws to remove, unplug 2 cables and slide the old one out.
If you have files that you don't want to lose and don't have a backup on external usb hdd or dvd's I would get that done soon...if vista Backup will run.
If you don't have a Recovery set>> Contact HP
******Clicking the Thumbs-Up button is a way to say -Thanks!.******
**Click Accept as Solution on a Reply that solves your issue to help others**

Extremely Slow Boot!

Help! I recently brought my computer to an apple store for a repair because it would not turn on at all (the battery indicators on the bottom of the battery and on the ring where the power adapter is plugged in were on, but that's it). The computer was sent away and when it returned it turned on, but now has a few new problems.
My computer now takes up to 10 minutes to boot up (it spends this time on the gray screen, with the apple symbol and the little circle going round and round). When the computer boots normally it is not unusual for all processes to run extremely slow. The computer sometimes boots normally (around a minute and a half) but it usually takes more than 6 minutes. When the computer is acting slow (in boot or in OS 10) it makes a light clicking noise like a fast clock. Also, my computer occasionally boots to Darwin BSD.
The sheet that I got when my computer was repaired said that my OS was reconfigured. One of my friends seems to think that they replaced my harddrive improperly.
Please offer any help you can. I'm upset because I have already invested a good amount of money in repairing my computer and I don't want to spend more money with apple's phone support (if it's a software issue).

Try booting into Safe Mode. This will take awhile longer than a normal startup because it does a file check and repair of the hard disk. (Note that it will tell you "Safe Boot" during the startup process if you have done it correctly.)
You will see your normal desktop. Once completely started up, restart normally, and go to Applications/Utilities/Disk Utility. Click on the top hard drive icon in the left sidebar and note the S.M.A.R.T. status at the bottom right of the pane. What does it say?
Select the named boot volume in the left sidebar, and repair permissions on it.
See if a little hard drive maintenance helps things out.

Extremely slow boot on MacBook Air

Hello!
Up to one week ago my MacBook Air was booting in 10 seconds.
Suddenly it takes over 3 minutes to startup. I did not have installed any particular application or service in the last weeks
I checked the logs and the only strange lines are:
May 7 21:23:11 localhost bootlog[0]: BOOT_TIME 1399490591 0
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.appstore" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.authd" sharing output destination "/var/log/system.log" with ASL Module "com.apple.asl".
          Output parameters from ASL Module "com.apple.asl" override any specified in ASL Module "com.apple.authd".
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.authd" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.bookstore" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.eventmonitor" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.install" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.iokit.power" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.mail" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.MessageTracer" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.performance" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:38 localhost syslogd[17]: Configuration Notice:
          ASL Module "com.apple.securityd" claims selected messages.
          Those messages may not appear in standard system log files or in the ASL database.
May 7 21:26:39 --- last message repeated 6 times ---
May 7 21:26:38 localhost kernel[0]: Longterm timer threshold: 1000 ms
Please note the 3 minutes delay betweek line 1 and line 2.
I tried to resolve the issue by resetting PRAM and reparing the disk (no repair required).
Thanks in advance.

Do you have bootcamp or a VM installed?
Remove all external devices then test. Do you still see the same slow boot?
This solution was posted here:
Clear the kext caches:
sudo chown root:admin (enter password)
sudo kextcache -system-prelinked-kernel
sudo kextcache -system-caches
Do in terminal and reboot. make sure your start up disk is still selected correctly in preferences.
If you search on "ASL Module "com.apple.appstore" claims selected messages." you'll find lots of results and none had the magic bullet fix.
If performance after login is not affected, you might have to live with this until there is a fix.
You need to report it to Apple Feedback so it can be logged and put in the queue to be fixed.
http://www.apple.com/feedback/macosx.html

W520 extremely slow boot - cause and workaround

I have a W520 2820QM BIOS 1.26 with an Intel 510. I've recently experienced a slow boot up issue and wanted to let Lenovo staff know about this to report to engineering.
This is [B]not[/B] the well-known 40 secs delay on warm reboot with the Intel 510. This is a 5 minute delay during POST until the BIOS passes over to the OS upon which the laptop runs at normal speedup. It also happens on a cold boot. The laptop will sit for up to 5 minutes at the Thinkpad logo and another 3 Minutes after the BIOS fingerprint read.
The cause is my HTC Desire S, connected to the blue USB 3 port during bootup. The Desire is in charge-only mode and I can reproduce the slowdown issue reliably by connecting the phone and fix it by removing it. The phone doesn't cause any problem after the OS was started. When the phone is connected to the yellow USB 2 port the laptop doesn't start at all, the Thinkpad logo never appears (or it boots even slower and I wasn't patient enough to wait for the logo to appear).
I'm assuming the Desire won't be the only phone causing this.

According to your description it seems like the same issue (or at least very similar) we have with an external WD Essentials USB 3.0 harddrive. http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-won-t-boot-when-docked-in-mini-dock/td-p/... As far as I know there is no workaround and I'm not sure if Lenovo is working on a fix.
Lenovo ThinkPad W520 15.6" 1920x1080, UEFI 1.42, Intel Core i7-2820QM 2.3GHz, Intel HD3000 + nVidia Quadro 2000M 2GB, Kingston PNP 16GB (4x4GB) 1600MHz RAM, Crucial m4 040H 256GB SSD, Lenovo TP Drive Adapter UltraBay 12,7mm + WD Blue 1TB 5400rpm HDD, Intel Centrino Ultimate-N 6300 AGN, Gobi 3000, Lenovo TP Port Mini Dock Plus Series 3, Windows 8.1 Pro 64bit

Laptop extremely slow boot up & slow everything after faulty boot up! HELP!

Hello. I'm not sure if this is the right section of the forums but I sure hope it is because I extremely need help.
My laptop was working completely fine a week ago! But then, all of a sudden, I turned it on and it went to a black screen with a bunch of numbers and letters. It was asking me to put in the start up CD(?). I had no idea what to do and didn't have the 'start up CD'(whatever that may be..) with me, so I pressed the power button. It turned off and turned back on.
But instead of working normally, it took about ten minutes to start up with about five minutes of that being a black screen with a mouse after putting in my user password. And now every program I have takes forever to open and just everything is extremely slow.
Please help. I really want my old, functional laptop back.

Your best bet is probably contacting Toshiba Tech Support: (800) 457-7777
The free version of Malwarebytes is just an AV scanner. Sometimes I use it as a second opinion AV scanner. I install it, run it then uninstall it when it's finished. It's advisable to have a reatime AV program. I use Microsoft Security Essentials. It's free, works well, and doesn't slow the system. You can get it HERE free.
Satellite C640/C650 Series User’s Guide
Creating recovery DVDs/media - page 68
Recovering the Internal Storage Drive - page 59
Recovering to out-of-box state - page 61
Backup your files. Create recovery DVD's. Use good quality DVD-R disks. You'll need them to install the software if you have to replace the HD. If you don't make them and the HD fails you'll have to purchase them from Toshiba. They cost about $30.

Extremely slow boot and shut down

I've been experiencing VERY slow boot up and shut down times (in excess of one minute for both booting and shutting down). I've removed everything from my login items and I still have the same problem. I have a late 2007 black MacBook with 10.5.3 on it. Any help would be appreciated!

Try running a cache cleaner and clear out all system and user cache files. Onyx is a good freeware application for this. There are several others of course.
http://www.titanium.free.fr/pgs2/english/download.html

Extremely slow boot time on fresh install (Cinnamon + GDM)

Hi,
I have a fresh installation of Arch with Cinnamon + GDM taking about 2 minutes and 30 seconds (observed manually) from Grub menu to loading of desktop in usable condition.
It's installed on external USB drive. Although the hardware is old but rebooted within 15 seconds in VM on internal HD drive with same Cinnamon and SDDM.
Details are:
#1. Hardware info:
AMD Athlon 64 X2 Dual Core Processor 4800+ x 2
Memory 2.7 GB
Hard drive 149.4 GB
GPU : nVidia Corp; GT 218 [GeForce 210]
USB wi-fi card
Arch vanilla kernel: 3.17.2-1
Problems:
a) Delay during loading of kernel modules,
b) Extreme delay in loading of display manager for login, and
c) Delay in loading of desktop.
I followed these guides:
Maximizing performance
Improve boot performance
Did not find any relevant tip to fix problems.
#2. systemd-analyze
Startup finished in 16.354s (kernel) + 10.182s (userspace) = 26.536s
It's wrong.
#3. systemd-analyze blame
4.151s wpa_supplicant.service
4.048s NetworkManager.service
1.623s colord.service
1.479s accounts-daemon.service
912ms systemd-logind.service
886ms gdm.service
679ms polkit.service
571ms [email protected]
548ms dev-hugepages.mount
547ms sys-kernel-debug.mount
524ms tmp.mount
512ms udisks2.service
475ms sys-kernel-config.mount
448ms dev-mqueue.mount
435ms systemd-remount-fs.service
423ms systemd-udev-trigger.service
409ms systemd-vconsole-setup.service
349ms [email protected]
330ms systemd-sysctl.service
258ms kmod-static-nodes.service
254ms systemd-tmpfiles-setup-dev.service
242ms upower.service
240ms systemd-journal-flush.service
218ms systemd-tmpfiles-setup.service
200ms rtkit-daemon.service
150ms systemd-random-seed.service
129ms home.mount
108ms systemd-user-sessions.service
94ms dev-sdb3.swap
88ms [email protected]
64ms systemd-update-utmp.service
60ms systemd-tmpfiles-clean.service
39ms [email protected]
27ms systemd-udevd.service
4ms sys-fs-fuse-connections.mount
Seems no problem.
#4. dmesg
Complete : http://pastebin.com/w7sXtuKh
Extract : Based on what I think adds delay
[ 22.277994] systemd-journald[138]: Received request to flush runtime journal from PID 1
[ 26.674187] r8169 0000:02:0f.0 enp2s15: link down
[ 26.674207] r8169 0000:02:0f.0 enp2s15: link down
[ 26.674267] IPv6: ADDRCONF(NETDEV_UP): enp2s15: link is not ready
[ 26.700183] ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'
[ 26.729912] ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.29
[ 27.117488] IPv6: ADDRCONF(NETDEV_UP): wlp0s19f5u3: link is not ready
[ 53.360188] nvidia 0000:01:00.0: irq 25 for MSI/MSI-X
[ 53.951157] NVRM: Your system is not currently configured to drive a VGA console
[ 53.951164] NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
[ 53.951167] NVRM: requires the use of a text-mode VGA console. Use of other console
[ 53.951170] NVRM: drivers including, but not limited to, vesafb, may result in
[ 53.951172] NVRM: corruption and stability problems, and is not supported.
[ 58.436865] wlp0s19f5u3: authenticate with 00:1f:fb:39:4c:24
[ 58.467542] wlp0s19f5u3: send auth to 00:1f:fb:39:4c:24 (try 1/3)
[ 58.469250] wlp0s19f5u3: authenticated
[ 58.469512] rt2800usb 2-3:1.0 wlp0s19f5u3: disabling HT/VHT due to WEP/TKIP use
[ 58.470040] wlp0s19f5u3: associate with 00:1f:fb:39:4c:24 (try 1/3)
[ 58.478853] wlp0s19f5u3: RX AssocResp from 00:1f:fb:39:4c:24 (capab=0x411 status=0 aid=3)
[ 58.485469] wlp0s19f5u3: associated
[ 58.485510] IPv6: ADDRCONF(NETDEV_CHANGE): wlp0s19f5u3: link becomes ready
[ 58.485555] cfg80211: Calling CRDA to update world regulatory domain
[ 70.688882] fuse init (API version 7.23)
[ 283.405686] cfg80211: Calling CRDA to update world regulatory domain
#5. Important observation:
hdparm -t reports 13.54 mb /sec reads for the external drive I am using for this installation. I don't face lag or slowness after boot including another distro installed on this drive had this problem.
Please help in further analyzing and fixing this problem.
Thanks!

How fast does it boot to a tty? Disable gdm and boot to a tty. See if that is any faster than starting gdm. Gdm takes a while to start up if I run it on my computer and I have an SSD. But it will add several seconds to my boot time which from systemd-analyze is 9 seconds.
So, boot to a tty and use startx to start the session and see if it's any faster. 13MB/s seems like a pretty tight bottleneck for starting big applications like gdm and a desktop environment. I run a pretty simple openbox setup as my environment and it only uses 150 MB of memory after I startx. But if I could only load 13 MB /s from memory it would add another 11 seconds to the time it took me to startx.
So see how fast you can boot, and then see how fast you can load your desktop using startx. When I booted an install media of arch on an old computer with usb2 it took about 10 minutes to get everything going.

Macbook Pro Unibody - EXTREMELY slow boot

A friend brought me his Macbook Pro last night that he had recently purchased used which had Ubuntu on it but now he wanted OS X. When I first turned on the MBP, it booted into Ubuntu fine, albeit a bit slow but I wasn't initially worried because I was going to wipe and replace anyways.
When I attempted to boot from the optical drive, however, I became a bit more worried. Holding down the option key, the install disk showed up promptly and when chosen, would spin up. However, it seemed about a minute or so into the process the optical drive would spin down and the spinner icon had not appeared. I tried the same process with an external optical drive as well as a different version of the OS, all of which gave me the same response.
After reading a bit online, it seems that if you aren't sure how to install a unix distro and you don't set the partitions up correctly, you can cause a similar behavior. Hoping to alleviate this issue, I wiped the drive via firewire using my iMac as the master which completed successfully. I then tried to boot from the optical drive again as I had done previously but ran into the same behavior.
The final attempt I am making is to drive the process via my older iMac over a firewire cable (I'm still installing) which has seemed to work so far, though I'm a bit concerned b/c the iMac is clearly not the same hardware as the MBP.
Has anyone seen this symptom before and if so, what would it be indicative of? My gut instinct was that this was a hardware issue, either RAM or (hopefully not) motherboard related but I wanted to exhaust all other possibilities first.

When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

Extremely slow boot and shut down process; very stance crashes;

I have re-installed OSX lion three times already. Everytime I carried out a clean install on my Macbook core duo 2 3Gb ram, 500GB hard drive, 2006 model.
All the times the OS appears to be as slow as ever on booting (approx 2 minutes or more).
The apple logo stays on for quite a while then It disappears and the cursor appears on screen then the logo comes back on again for another couple of seconds and then the desktop slowly appears but still i have to wait for another couple fo seconds before I can use it.
Then once the desktop is up and running if I open safari along with Mail both of them stay unresponsive for a while before I can get to do some work.
Not to mention the shut down process; it takes at times up to 2 minutes.
I checked all the processes in the Activity Monitor and there doesn't seem to be any process slowing or taking loads of memory.
The only app that i could think of is Quicksilver which I have promptly removed/unisntalled without any changes in boot times etc.
Is there any other thing/test I could carry out to find out or resolve this issue??
I have also run disk utility Permission check/fix, disk check from Rescue disk but nothing seems to work and I can't find anything to help on the net.

Try running a cache cleaner and clear out all system and user cache files. Onyx is a good freeware application for this. There are several others of course.
http://www.titanium.free.fr/pgs2/english/download.html

Hp dv7 intel, windows 10 extremely slow boot times and lagging and glicthy

I did the free upgrade and the boot time was really really slow. once it came up it was really laggy for a little bit too.i figured might of been an issue with the upgrade instead of a clean boot. so i erased and did a clean boot as well and still had the forever boot time with black screen.. i went back to windows 7 and no issues. has anyone else had this issue with the pavalilion dv7? if so what did you do to fix it?

Hi there & , Thank you for visiting the HP Support Forums and Welcome! This is a great site to get answers and ask questions. I have looked into the issue you are having with the boot time being slow on your Notebook with Windows 10. I did some research and found a way to make the boot time faster. Although this site is not affiliated with HP, it has some great step by step instructions. The topic is called Fast Startup - Turn On or Off in Windows 10. Here is a link to the HP Support Assistant if you need it. Just download and run the application and it will help with the software and drivers on your system that need updating for Windows 10. Updated Windows 10 drivers will become available on the HP Drivers and Downloads Page for your product. They will be released as they become available to HP. Please follow these provided troubleshooting steps, re-post and let me know how everything went. Thank you! Have a great day!

Extreme slow boot time + HDD access - AMD FX 7500, 4 GB RAM, 1 TB HDD

My problem is weird. I bought a brand new Lenovo z50-75 laptop. 4 cores, 4 Gb RAM, etc. I installed a 64 bit Windows 7 (SP1) on it. After I installed the Windows, the boot was long and the programs loaded slow too. So I downloaded the latest Ahci drivers (14.9), but nothing changed. I decided to try this out with SSD (Kingston SSDNow V300). The results were the same, the machine was SLOW! The Ahci is ON - I checked it in BIOS. What is happening? Please help me!

Hello,voI have exactly the same laptop (Z50-75 AMD FX-7500 with 8GB RAM and Seagate SSHD 1TB) and excatly the same problem. I have change the HD and install a new SSD (samsung evo 850) and the same problem.Also I try with a new install of win7 64 bits without AV and any drivers and nearly two minutes fot boot. With the original windows 8 was working fine.I suspect that this notebook works just fine with Windows 8 because of the bios, I do not want to upgrade the bios because in my other lenovo B30-50 I upgrade the bios and now I can not use windows 7 anymore. Very bad from lenovo. Juan

Satellite L550-19U PSLW8E - extremly slow boot sequence

When I start my laptop it hangs on bios startup sequence.
I see lines:
"System BIOS shadowed"
"Video BIOS shadowed"
and need to wait about 3 minutes before it continues to boot.
Then I see next lines:
"Fixed disk 0: FUJITSU MJA2320BH G2"
"Mouse intialized"
And need to wait again about 1 minute before it continues.
No error messages shown. Tried to update BIOS to 1.9 - problem not gone.
Please assist.
Message was edited by: rodygin
Message was edited by: rodygin

Are any external devices connected to the notebook?
If yes, disconnect it.
Try also to boot the notebook using one memory module in each slot.
Would be interesting to know how the notebook would act.
Furthermore try this:
Disconnect the AC adaptor and remove the battery
Press and hold the power button 30 sec long. Then connect both parts again.
Test the unit.
If nothing helps, I guess there is an hardware problem. Probably the POST (power on self-test) cannot be passed properly or it hangs. Mostly this is an result of hardware malfunction.

Extremely slow boot in my MBP Retina

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