Screen freezes and have to restart

I have a MacBook 2,1 and every now and then my screen freezes and a message appears saying I have to press restart or hold down the power button. The message is written in 3 or four languages including Chinese and German. When it happens I have no choice but to shut down and lose whatever I'm doing. A message then comes on when I reboot saying that the computer had to shut down unexpectedly and asks me if I wish to report the error. Sometimes I click yes, sometimes no as to be honest I don't know what good it does.
To try and rectify the problem I installed Snow Leopard and have tried inserting the installation disc that came with my mac and running extended system scan. I have also rebooted holding down function S. None of the above have worked.
Anyone have any other ideas as this is getting seriously annoying

ibngazelle wrote:
I have a MacBook 2,1 and every now and then my screen freezes and a message appears saying I have to press restart or hold down the power button. The message is written in 3 or four languages including Chinese and German.
This is a kernel panic. They are often hardware related. Here's some info:
http://support.apple.com/kb/HT1392
http://www.thexlab.com/faqs/kernelpanics.html
Good luck!

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Does anyone screen freeze and have white lines going through it

My screen seems to freeze and have white lines going through it like its defective. It happen about 6 times already today.

Hi,
To do the PRAM reset, just click on the highlighted words in my last post, it will take you to an Apple Support page which tells you how to do it. No, it will not delete anything.
If you have only had it 10 months, it is under the standard 1-year warranty.
To make an appointment with the Genius Bar, visit this site. If you are not in the United States, choose your region from the pulldown menu on the right.
By the way, that PRAM link is for Yosemite. If you have Mavericks, go here.

How to get this script to auto detect if the server freezes and have it restart automatically

taskkill /im arma2oaserver.exe
timeout 4
taskkill /F /im arma2oaserver.exe
timeout 4
:: fix the hive ini file..
set dayzpath="D:\DayZ_Server_Panthera"
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start "" "dayz_epoch_set_to_day.bat"
timeout 4
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Hi there
Normally all you need to do is specify the file name. No path or URL needed. Just the file name. After that, ensure the file exists in the same folder as the Captivate.
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Click here for Adobe Authorized Captivate and RoboHelp HTML Training
Click here for the SorcerStone Blog
Click here for RoboHelp and Captivate eBooks

MacBook Pro screen glitches out, gray lines appear on it then my computer freezes and must be restarted sometimes it will beep 3 times when restarting and other times it won't. Is this a virus?

I have a MacBook Pro running mavericks. Sometimes the screen glitches out, gray lines appear on it then my computer freezes and must be restarted sometimes it will beep 3 times when restarting and other times it won't. Is this a virus, software issue, water damage, etc? An error message usually appears after being restarted. It does it all the time please help.

No Virus. You have a Hardware Problem. 3 Beeps means a RAM problem. You could try Reseating the RAM is its sockets.
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Screen freezes and popup message says I need to do a shutdown and then restart. It does it sometimes 2 times a day. Im new to apple and need help.

My screen freezes and popup message says I need to do a shutdown and then restart. It does it sometimes 2 times a day. Im new to apple and need help.

Bad or incompatible RAM is, more often then not, the cause of most Kernel Panics. It could also just need to be reset.
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Here is a great MacFixIt article.
 Good Luck!
DALE

Iphone 6 screen freeze and restart

Hello to all,my iphone 6 64gb is new almost one month,i observed that lot of times per day screen frozen and also frequent restarts,have you any idea?

First, reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again. You will not lose any data by resetting, but it can cure some glitches.
If this does not work, and to make sure that this is not software related, set it back to factory settings, without using any backup data afterwards. Set up the rest of the personal settings manually and test the phone.
If the phone works as expected, restore from the latest backup. If the problem comes back, the backup data contained corrupt data, causing your issues.
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iPhone - Contact Support - Apple Support

IPhone 6 screen freezes and can't find wifi after iOS 8.0.2 update

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Hey there Shortos,
It sounds like your phone touchscreen is not consistently working for you after updating to iOS 8. I can see how that would be pretty frustrating. It sounds to me like this could be a software issue or an issue with the screen itself. I would start with the troubleshooting in the following article to help troubleshoot the screen itself:
iPhone, iPad, iPod touch: Troubleshooting touchscreen response
Restart your device
Hold the On/Off button until "slide to power off" appears. Slide to power off your device. When it is off, press the On/Off button to turn it back on.
If you can't restart your device, reset it by pressing and holding the Sleep/Wake button and the Home button at the same time for a least ten seconds, until the Apple logo appears.
Clean the screen with a soft, slightly damp, lint-free cloth.
Avoid using the device while wearing gloves, with wet hands, or immediately after applying hand lotion.
If you have a protective case, or if you are using a plastic sheet or film on the display, try removing them and testing the device without it.
If that does not resolve the issue, I would next quit all the running apps on the device:
iOS: Force an app to close
Double-click the Home button.
Swipe left or right until you have located the app you wish to close.
Swipe the app up to close it.
When you have done that restart the device and test the issue again:
iOS: Turning off and on (restarting) and resetting
Thank you for using Apple Support Communities.
All the very best,
Sterling

My iMac screen freezes and a grey colour slowly creeps down my screen

Hi, my iMac screen freezes and a grey colour slowly creeps down the screen and has a large black square in the centre saying "You must restart your computer by pressing the power button and then pressing it again to restart" or words to that effect in English and about 4 or 5 other languages. I find this happens more frequently when I try to stream movies or tv shows. It also happened when I was trying to download a couple of tv shows from iTunes.
It also sometimes makes a wierd sound a kind of loud noise like a record stuck in a groove. This has happend many times since upgrading to Lion. I hear a lot of people on here talking about their screens going completely black and not responding. I believe that mine has only gone black a couple of times and I couldn't wake it up from "sleep mode" with the mouse or keyboard. I don't know if this is also happening to other people, but my bluetooth keyboard keeps disconnecting all the time since the upgrade as well, it's driving me nuts!! Plus my wifi will show that it is fully operational, however, I can't use the internet when I wake my computer from sleep mode. I have to click on wifi and turn wifi off then on again before i can use it.
Is Apple going to come out with a fix or are we going to eternally suffer indefinitley.

Hi Eric,
I don't know why it didn't work before, but here is the most recent errol log. It crashed again about an hour later. If there is a solution, i would greatly appreciate knowing what it is because I can't enjoy using my computer anymore because of these constant crasahes.
Thanks for your time.
Interval Since Last Panic Report: 1060363 sec
Panics Since Last Report:          12
Anonymous UUID:                    065BD067-AFE6-4AB4-AEF2-30EF089ECE4C
Mon Oct 3 16:08:51 2011
panic(cpu 0 caller 0xffffff80002c268d): Kernel trap at 0xffffff7f80eb7282, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x00000001006de5dc, CR3: 0x0000000035e9a003, CR4: 0x00000000000206e0
RAX: 0x00000000fffd1485, RBX: 0x0ae8df8948ee7500, RCX: 0xffffff800c5d1d74, RDX: 0xffffff807fbf3584
RSP: 0xffffff807fbf3310, RBP: 0xffffff807fbf3370, RSI: 0xffffff807b04a000, RDI: 0xffffff8000289003
R8: 0xffffff806af44e34, R9: 0xffffff807b04a078, R10: 0xfffffffffffffffe, R11: 0xffffff80002d8240
R12: 0xffffff807b04a000, R13: 0xffffff800c5d1d6c, R14: 0xffffff8000289003, R15: 0x00000005b80002a8
RFL: 0x0000000000010282, RIP: 0xffffff7f80eb7282, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0x00000001006de5dc, Error code: 0x0000000000000000, Faulting CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff807fbf2fd0 : 0xffffff8000220702
0xffffff807fbf3050 : 0xffffff80002c268d
0xffffff807fbf31f0 : 0xffffff80002d7a3d
0xffffff807fbf3210 : 0xffffff7f80eb7282
0xffffff807fbf3370 : 0xffffff7f80e9dfe5
0xffffff807fbf3510 : 0xffffff7f80ef8726
0xffffff807fbf3570 : 0xffffff7f80ef8985
0xffffff807fbf35b0 : 0xffffff7f80e869ee
0xffffff807fbf35c0 : 0xffffff7f80eb7bb5
0xffffff807fbf3630 : 0xffffff7f80e83879
0xffffff807fbf3670 : 0xffffff7f8091d255
0xffffff807fbf36b0 : 0xffffff8000639d0e
0xffffff807fbf3700 : 0xffffff7f8091d1d6
0xffffff807fbf3720 : 0xffffff7f8091d793
0xffffff807fbf3760 : 0xffffff7f8091cd81
0xffffff807fbf3790 : 0xffffff7f80e429e9
0xffffff807fbf37e0 : 0xffffff8000344b0b
0xffffff807fbf38f0 : 0xffffff80003c333d
0xffffff807fbf3b60 : 0xffffff80003caee9
0xffffff807fbf3c00 : 0xffffff80003cb3de
0xffffff807fbf3df0 : 0xffffff80003d2a6b
0xffffff807fbf3e10 : 0xffffff8000580f25
0xffffff807fbf3e60 : 0xffffff8000581185
0xffffff807fbf3e80 : 0xffffff8000532ec4
0xffffff807fbf3ee0 : 0xffffff8000533dd3
0xffffff807fbf3f20 : 0xffffff8000533ea7
0xffffff807fbf3f50 : 0xffffff80005ca88b
0xffffff807fbf3fb0 : 0xffffff80002d8383
      Kernel Extensions in backtrace:
         com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000->0xffffff7f80936fff
         com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e2c000->0xffffff7f80e63fff
            dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000
         com.apple.driver.AirPort.Atheros40(500.55.5)[01000ACB-C064-3F42-820F-BDE2008267 25]@0xffffff7f80e64000->0xffffff7f80fa3fff
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)[95ABB490-3AB5-3D5E-9C21-67089A9AE6A1]@0xffff ff7f80821000
            dependency: com.apple.iokit.IO80211Family(400.40)[78A58272-2170-3068-9C63-88301C99C406]@0xf fffff7f80e2c000
            dependency: com.apple.iokit.IONetworkingFamily(2.0)[59A00F6B-3710-3E07-9921-70C45782FF8C]@0 xffffff7f8090e000
BSD process name corresponding to current thread: MailTab for Gmai
Mac OS version:
11B26
Kernel version:
Darwin Kernel Version 11.1.0: Tue Jul 26 16:07:11 PDT 2011; root:xnu-1699.22.81~1/RELEASE_X86_64
Kernel UUID: D52AAB80-B2BC-3C6E-BBEA-78BD28064998
System model name: iMac11,2 (Mac-F2238AC8)
System uptime in nanoseconds: 2869233943350
last loaded kext at 367480732136: com.apple.iokit.IOAVBFamily    1.0.0d22 (addr 0xffffff7f8078d000, size 36864)
last unloaded kext at 437236879883: com.apple.iokit.IOAVBFamily    1.0.0d22 (addr 0xffffff7f8078d000, size 36864)
loaded kexts:
com.apple.driver.AppleHWSensor    1.9.4d0
com.apple.driver.AppleBluetoothMultitouch    66.3
com.apple.filesystems.autofs    3.0
com.apple.driver.AppleMikeyHIDDriver    122
com.apple.driver.AppleUpstreamUserClient    3.5.9
com.apple.driver.AppleMCCSControl    1.0.24
com.apple.driver.AppleHDA    2.1.1f12
com.apple.driver.AGPM    100.12.40
com.apple.driver.AppleMikeyDriver    2.1.1f12
com.apple.kext.ATIFramebuffer    7.0.4
com.apple.ATIRadeonX2000    7.0.4
com.apple.driver.AudioAUUC    1.59
com.apple.iokit.IOUserEthernet    1.0.0d1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AudioIPCDriver    1.2.0
com.apple.driver.AirPort.Atheros40    500.55.5
com.apple.driver.ACPI_SMC_PlatformPlugin    4.7.0b2
com.apple.driver.AppleLPC    1.5.1
com.apple.driver.AppleBacklight    170.1.9
com.apple.driver.AppleUSBCardReader    3.0.0
com.apple.driver.AppleIRController    309
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    32
com.apple.iokit.SCSITaskUserClient    3.0.0
com.apple.driver.AppleFWOHCI    4.8.6
com.apple.iokit.IOAHCIBlockStorage    2.0.0
com.apple.driver.AppleUSBHub    4.4.0
com.apple.driver.AppleEFINVRAM    1.5.0
com.apple.driver.AppleAHCIPort    2.1.8
com.apple.iokit.AppleBCM5701Ethernet    3.0.6b9
com.apple.driver.AppleACPIButtons    1.4
com.apple.driver.AppleUSBEHCI    4.4.0
com.apple.driver.AppleRTC    1.4
com.apple.driver.AppleHPET    1.6
com.apple.driver.AppleSMBIOS    1.7
com.apple.driver.AppleACPIEC    1.4
com.apple.driver.AppleAPIC    1.5
com.apple.driver.AppleIntelCPUPowerManagementClient    166.0.0
com.apple.nke.applicationfirewall    3.0.30
com.apple.security.quarantine    1
com.apple.driver.AppleIntelCPUPowerManagement    166.0.0
com.apple.driver.AppleBluetoothHIDKeyboard    152.3
com.apple.driver.AppleHIDKeyboard    152.3
com.apple.driver.AppleMultitouchDriver    220.62
com.apple.driver.IOBluetoothHIDDriver    2.5f17
com.apple.kext.triggers    1.0
com.apple.driver.DspFuncLib    2.1.1f12
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.kext.ATI4600Controller    7.0.4
com.apple.kext.ATISupport    7.0.4
com.apple.iokit.IOSurface    80.0
com.apple.iokit.IOBluetoothSerialManager    2.5f17
com.apple.iokit.IOSerialFamily    10.0.5
com.apple.iokit.IOFireWireIP    2.2.3
com.apple.iokit.IOAudioFamily    1.8.3fc11
com.apple.kext.OSvKernDSPLib    1.3
com.apple.driver.AppleHDAController    2.1.1f12
com.apple.iokit.IOHDAFamily    2.1.1f12
com.apple.iokit.IO80211Family    400.40
com.apple.driver.AppleSMC    3.1.1d2
com.apple.driver.IOPlatformPluginFamily    4.7.0b2
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleBacklightExpert    1.0.3
com.apple.iokit.IONDRVSupport    2.3
com.apple.iokit.IOGraphicsFamily    2.3
com.apple.driver.BroadcomUSBBluetoothHCIController    2.5f17
com.apple.driver.AppleUSBBluetoothHCIController    2.5f17
com.apple.iokit.IOBluetoothFamily    2.5f17
com.apple.iokit.IOSCSIBlockCommandsDevice    3.0.0
com.apple.iokit.IOUSBMassStorageClass    3.0.0
com.apple.iokit.IOUSBHIDDriver    4.4.0
com.apple.driver.AppleUSBMergeNub    4.4.0
com.apple.driver.AppleUSBComposite    3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.0.0
com.apple.iokit.IOBDStorageFamily    1.6
com.apple.iokit.IODVDStorageFamily    1.6
com.apple.iokit.IOCDStorageFamily    1.7
com.apple.driver.XsanFilter    403
com.apple.iokit.IOFireWireFamily    4.4.3
com.apple.iokit.IOAHCISerialATAPI    2.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily    3.0.0
com.apple.iokit.IOUSBUserClient    4.4.0
com.apple.iokit.IOAHCIFamily    2.0.6
com.apple.iokit.IOEthernetAVBController    1.0.0d5
com.apple.iokit.IONetworkingFamily    2.0
com.apple.driver.AppleEFIRuntime    1.5.0
com.apple.iokit.IOHIDFamily    1.7.0
com.apple.iokit.IOUSBFamily    4.4.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    165
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    7
com.apple.driver.DiskImages    326
com.apple.iokit.IOStorageFamily    1.7
com.apple.driver.AppleKeyStore    28.18
com.apple.driver.AppleACPIPlatform    1.4
com.apple.iokit.IOPCIFamily    2.6.5
com.apple.iokit.IOACPIFamily    1.4
Model: iMac11,2, BootROM IM112.0057.B00, 2 processors, Intel Core i3, 3.06 GHz, 4 GB, SMC 1.64f5
Graphics: ATI Radeon HD 4670, ATI Radeon HD 4670, PCIe, 256 MB
Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353637334648302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.55.4-P2P
Bluetooth: Version 2.5.0f17, 2 service, 19 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST3500418AS, 500.11 GB
Serial ATA Device: HL-DT-STDVDRW GA32N
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa120000 / 4
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0xfa111000 / 5

I just got my Mac Pro repaired from Apple but I am experiencing the same issue: Screen freezes and shows funny rectangular bars. I shut it down manually and when I try to turn it back on it beeps 3 times. I know its the RAM but is there a way I can fix it

I just got my Mac Pro repaired from Apple but I am experiencing the same issue: Screen freezes and shows funny rectangular bars. I shut it down manually and when I try to turn it back on it beeps 3 times. I know its the RAM but is there a way I can fix it

If you just got it back and it isn't fixed or something else is wrong with it take it back and have them do the repair correctly.

While using Skype on my mac pro the screen freezes and splits in two and the left hand side shifts to the right and the right shifts to the left with a large black block down the centre, should I take it back to store as it is only a month old??

I have only had my mac one month and it seems while I use Skype the screen freezes and I cant click on anything and everything on the right hand side of the screen shifts to the left and the left to the right with a back block down the centre and sometimes lines running down the screen over all. As it is almost brand new should I be going back to store to get this problem fixed??

Yes. You are still under warranty. Why waste it?

Playing music the screen freezes and if i want to make changes it will not let me.I go to restore factory settings and afterwards i am able to listen,view album covers,and change the type of music i want.Is there a better way to do this? Thx

When playing music on my ipad the screen freezes and i am not able to view album covers or make any changes i am only able to hear what i selected.
This is the third time it has happened since i updated to the new IOS 5.1. It never happened before.
If i go to Summary and restore the ipad to the factory settings then i'm able to run it as normal.
Is this a glitch in the new software,or a problem with my ipad?
Thanks for any help

Thanks Russ H and Ross H!
I'm finding Multicam, combined with Compound Clips to be extrememly efficient.
I started with 2 different video clips, along with 2 different audio clips.
Layed out both clips side by side (visually, they are on top of each other on the timeline),and made that a single compound clip.
Then I laid out both audio clips on top of each other on the timeline and made those a compound clip.
So now I have
2 original individual Video shots
1 compound video shot of the 2 above side by side.
2 original audio tracks
1 compound audio track
Next I made a multicam track, and added to it all 3 video shots (2 original + 1 compound) And I added the compound audio track. I set that audio track to be "the" track.
It's just a little bit of setup, but really not that bad, and the ability to use the multicam feature to switch between shots, while keeping everything in sync is fantastic!
- Jack

Can't update from 10.0.0 to 10.2.8 as screen freezes and computer locks up

Can't update to 10.2.8 as screen freezes and computer locks up when using Pref/view/update/10.2.8 100 meg combo update. I have to wipe disk and reinstall 10.2.0
I can't find a stand alone combo that works with 10.2.0 - indeed I can not find any update for 10.2.0. I do find discussions of the 10.2.1 and 10.2.2 updates, and once one has 10.2.2 there is a combo to get to 10.2.8.
What is the solution - by the way I like 10.2.0 better than prior 9.2.2, and do not mind having to wipe disk and lose 9.2.2. But my wavelan 16 bit wireless PCMIA card, indeed any airport card, no longer is recognized. Indeed I can't find Airport. This is a 10 year old computer and files/docs etc are long gone (but life was good until I decided to move to X this month). How do I correct this lack of wireless (it does connect directly to my Ethernet line so getting on the web is no problem)?

Hello papau. Welcome to Apple Discussions.
You could try the 10.2.6 combo as that will install on 10.2
http://docs.info.apple.com/article.html?artnum=70174
and then 10.2.8 which requires 10.2.6 can be downloaded here.
http://www.apple.com/support/downloads/macosxupdate_.html
Run Repair Permissions in Disk Utility, found in Applications/Utilities/ before you start and once again when you finish.
During the installation process, just wait till the system completes things and not use any other applications until the update is finished.

Gateway DX4840 is Experiencing Screen Freezing and Crashing

I am running Windows 7. This problem started about three weeks ago. Occasionally the screen freezes and nothing will unfreeze it except a cold boot. Control-Alt-Delete does nothing. Sometimes the screen goes black. At other times the screen shows
an odd multicolour pattern. Occasionally the computer crashes altogether.
I can not seem to find any hardware problem. Sometimes the computer will run for several days with no difficulty. There is no sign of a virus. I have checked my C drive for problems and found nothing.
I normally run Chrome and sometimes Chrome and Explorer at the same time. Has anybody experienced this problem.
Thanks very much.

Hi,
Firstly, please check the issue with the method below:
Windows hangs or freezes
http://support.microsoft.com/kb/2681286
Meanwhile, I think you need also to check the hardware side; please ensure all the drivers are up-to-date and you can also contact Gateway support for help.
Thanks.
Nicholas Li
TechNet Community Support

The update screen freezes and will not let me use the beta

Whenever I try and open the Beta, it tries to add my previous firefox extensions into the beta. The screen freezes and when I close it, I cannot open the beta again. I uninstall it and try again and the same thing happens. I tried restarting my computer and nothing happened.

Create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile.
* http://kb.mozillazine.org/Testing_pre-release_versions
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

RMBP Late 2013 crash without log and have to restart by power button

I bought rMBP around November last year.
As I open Chrome, it crash without log.
The only solution is to restart it with power button.
I can't find the report by chrome://crashes and ~/Library/Logs/.
I think the kernel_task doesn't make it.
Are there anyone else got the same problem and solution?
Is there a proper noun for crash and have to restart it by power button?
Version:10.9.1(13B3116)

I would reformat the drive then reinstall Lion:
Install or Reinstall Lion from Scratch
If possible backup your files to an external drive or second internal 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.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Install button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

Screen freezes and have to restart

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