IMac keep shutting down black screen then have to hold power button down then turn it on again i did this 4 times in all of a period of 5 minutes what to do ??

iMac keep shutting down black screen then have to hold power button down then turn it on again i did this 4 times in all of a period of 15 minutes what to do ??

Hmm. The problem still may be the RAM - Apple buys the RAM it puts in its machines from third-party vendors (usually Hynix) so it could be a RAM problem.
There are a couple of things that you can do yourself before taking your machine into an Apple Store or an AASP... download and run an application named Rember that will run a RAM test for you - let it run for a couple of hours or even overnight. If it turns out that your RAM is faulty, Rember will let you know. If it is faulty, then you have a couple of options - replace the RAM yourself or (particularly if you're under warranty still) take the machine to an Apple Store or AASP and have them replace the RAM.
If Rember finds no fault with the RAM, then you'll need to take it into an Apple Store/AASP and get a free diagnosis on the machine. Three beeps do usually indicate faulty RAM, but if it tests good with Rember you likely have another problem - it could be something as simple as the RAM, somehow, not seated correctly or signs of another hardware problem.
Run Rember first... call back with results.
Good luck,
Clinton

Similar Messages

Mid-2010 15in. MacBook Pro going to black screen requiring reset by holding power button

Hello all,
     I have been searching for a problem solution for quite some time now. I have a mid-2010 15" Macbook Pro (2.4GHz Intel I5; 4 GB mem) updated to version 10.7.5. The computer randomly goes to a black screen, while the program / movie / whatever is still running (I can hear the sound) and then stalls. I then have to hold the power button down until it will reset. I will post the error message at the end of this.
     I have wiped the computer clean and reinstalled everything and that did not help. I am no longer under Apple warrenty and hoping that someone has experienced. Short of me finding an answer I will take it in to Apple. Thanks in advance for any help!
Error report:
Interval Since Last Panic Report: 9808 sec
Panics Since Last Report:          1
Anonymous UUID:                    716F24AA-2763-4A12-A3CA-877FE127FD02
Sat Sep 28 14:06:10 2013
panic(cpu 2 caller 0xffffff7f81425007): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0xffffff809e52e000 0x0a5480a2, D0, P2/4
Backtrace (CPU 2), Frame : Return Address
0xffffff807b1d37e0 : 0xffffff8000220792
0xffffff807b1d3860 : 0xffffff7f81425007
0xffffff807b1d38f0 : 0xffffff7f8151db83
0xffffff807b1d3950 : 0xffffff7f8151dbf7
0xffffff807b1d39c0 : 0xffffff7f823ad855
0xffffff807b1d3b00 : 0xffffff7f81541ddd
0xffffff807b1d3b30 : 0xffffff7f8142ed6a
0xffffff807b1d3be0 : 0xffffff7f8142a43c
0xffffff807b1d3dd0 : 0xffffff7f8142be4a
0xffffff807b1d3eb0 : 0xffffff7f813c032c
0xffffff807b1d3f00 : 0xffffff7f82570c0b
0xffffff807b1d3f50 : 0xffffff7f825714b2
0xffffff807b1d3f70 : 0xffffff800023dbbc
0xffffff807b1d3fb0 : 0xffffff8000820057
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f813 be000->0xffffff7f816b9fff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8082b000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f813ac000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f81373000
         com.apple.nvidia.nv50hal(7.3.2)[38ACBB3D-4E3C-3883-9A4B-67F15592905F]@0xffffff7 f82248000->0xffffff7f8256afff
            dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f813 be000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8082b000
         com.apple.driver.AGPM(100.12.75)[4EBF3D1C-F65A-32E5-8C97-B8AA89FD05FC]@0xffffff 7f8256e000->0xffffff7f8257efff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff 7f8082b000
            dependency: com.apple.driver.IOPlatformPluginFamily(5.1.1d6)[57AAAA9E-4530-35EE-ACB1-A4E893 53D507]@0xffffff7f80a89000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xff ffff7f813ac000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0 xffffff7f81373000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
11G63
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 12779383361706
last loaded kext at 302561508520: com.apple.filesystems.msdosfs
Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i5, 2.4 GHz, 4 GB, SMC 1.58f17
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.198.19.22)
Bluetooth: Version 4.0.8f17, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST9320325ASG, 320.07 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 5
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 4
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

You have the MacBookPro6,2, the Edsel of Macs. It may be covered by this program:
MacBook Pro (15-inch, Mid 2010): Intermittent black screen or loss of video
Make a "Genius" appointment at an Apple Store, or go to another authorized service provider, to have the machine tested. The routine hardware diagnostics used by service providers may not detect the fault. There is a specific test for this issue.
Print the first page of the panic report, and the support page linked above, and bring them with you.
Note that the replacement program only applies within three years of purchase. If you wait beyond that date, Apple may refuse the service. In that case, you'll be quoted a price of about $300 (in the U.S.) for a depot repair. The model was discontinued in February 2011, so the replacement program will be ending quite soon.
Back up all data on the internal drive(s) before you hand over your computer to anyone. If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Sometimes the replacement part is also defective, so be prepared for that possibility.
If it's too late for your unit to be repaired under the program, and you don't want to pay for a new logic board, you may be able to stop the panics by disabling automatic graphics switching.
*An SSD doesn't need to be zeroed.

My ipad 2 will cut off completely if not being used for a while. you have to hold power button to power up everytime. anyone else having this problem? thanks

My Ipad 2 will shut completely down if not being used for a while. You have to hold power button down for several minutes before it will power back on. anyone else have this problem and know how to fix? My other sons ipad 2 doesnt do this and they have both had updates and are same generation.
Thanks

I had major issues with the iPhone 4s battery, however it’s resolved.
The tech who set the phone up at the Apple store did so with little training.
if you have a mobile me account. First go and move all your data to the cloud by going on your computer and logging in at me.com/move. The cloud has replaced mobile me, so there is no need for those two accounts
Also make sure that for any of your email accounts you set them up to fetch, not push. My tech person set them all to have the email servers push data to the phone. The new iphone4s antenna is extremely strong so it will continually try to access stuff that is pushed–***** a lot of battery life doing this. It makes it worse if you have exchange 2010 accounts. Something about changes made to exchange really suck battery life from devices that access such accounts.
turning of locator and the push notifications from facebook--they have a lot!

New (3mo) macbook air screen goes black and sometimes won't come back on after I unplug it from the power cord. Any ideas why it is doing this? Sometimes I have to hold power button for 10 seconds for it to shut off then back on.

New (3mo) macbook air screen goes black and sometimes won't come back on after I unplug it from the power cord. Any ideas why it is doing this? Sometimes I have to hold power button for 10 seconds for it to shut off then back on. Sometimes holding the power button for a second is enough for it to come back on.

I took it to the Genius Bar, and they identified it as a hardware issue. Just got it back today. Parts replaced were:
620-5629 Display Module — Symptom: Distored/blurred/focus video issue
605-3284 Top Case with Keyboard — Symptom: specific key(s) do not work
So far so good. I'd suggest taking it in and not trying to work around it — it's a rare hardware issue (given the number of threads about it) and should be replaced.

I have a ipod nano shuffle, 6th gen. I bought it when I had Windows Vista. I upgraded to Windows Ultimate 7. Now it keeps shutting off. Have to press power button and touch arrow to restart. 3 to 4 times a song. I ran diagnostics. Passed until end.

Have iPod Nano Shuffle 6th Gen. I purchased it when I had Windows Vista. I have since upgraded to Windows 7 Ultimate . Was fine with Vista. Now, it keeps shutting off during the song, 3 or 4 times. Have to press power button and then arrow to restart song. I went to my iTunes and ran diagnostics. Passed all until the end. The last test had a red dot failure. It said no iPod, iPhone, or iPad found. Does someone know how I can correct the problem? iTunes is always updating, so I am current.

Sidney...
Try here > iPod shuffle troubleshooting and service FAQ

Hello. I dropped my ipad first gen from my chair, about 2 feet above the floor. The screen went black and I can't turn it on again. I have tried holding both buttons down at the same time, but nothing happens. Any help?

Hello. I dropped my ipad, first gen, from my chair to the floor. The screen went black and I can't start it again. I have tried to hold both buttons down at the same time, but nothing happens. Any help?

You will probably have to contact Apple for repair but before you do try this:
Turn your iPad upside down on your lap and give it a hard smack on the back.

My iPad 4 is stuck on the connect to iTunes screen. Have held the home button down while connecting the USB cable to the iPad and its not doing anything, not even showing up under my computer Please Help

IiPad is stuck in the iTunes connect screen. I have held the home button down while plugging the iPad in and still nothing. Hard reset isn't even doing anything. It's not even showing up under my computer. Please Help

Did you get a message that the iPad is disabled?
iOS: Device disabled after entering wrong passcode
http://support.apple.com/kb/ht1212
Using iPhone/iPad Recovery Mode
http://ipod.about.com/od/iphonetroubleshooting/a/Iphone-Recovery-Mode.htm
Saw this solution on another post about an iPad in a school enviroment. Might work on your iPad so you won't lose everything.
~~~~~~~~~~~~~
‘iPad is disabled’ fix without resetting using iTunes
Today I met my match with an iPad that had a passcode entered too many times, resulting in it displaying the message ‘iPad is disabled – Connect to iTunes’. This was a student iPad and since they use Notability for most of their work there was a chance that her files were not all backed up to the cloud. I really wanted to just re-activate the iPad instead of totally resetting it back to our default image.
I reached out to my PLN on Twitter and had some help from a few people through retweets and a couple of clarification tweets. I love that so many are willing to help out so quickly. Through this I also learned that I look like Lt. Riker from Star Trek (thanks @FillineMachine).
Through some trial and error (and a little sheer luck), I was able to reactivate the iPad without loosing any data. Note, this will only work on the computer it last synced with. Here’s how:
1. Configurator is useless in reactivating a locked iPad. You will only be able to completely reformat the iPad using Configurator. If that’s ok with you, go for it – otherwise don’t waste your time trying to figure it out.
2. Open iTunes with the iPad disconnected.
3. Connect the iPad to the computer and wait for it to show up in the devices section in iTunes.
4. Click on the iPad name when it appears and you will be given the option to restore a backup or setup as a new iPad (since it is locked).
5. Click ‘Setup as new iPad’ and then click restore.
6. The iPad will start backing up before it does the full restore and sync. CANCEL THE BACKUP IMMEDIATELY. You do this by clicking the small x in the status window in iTunes.
7. When the backup cancels, it immediately starts syncing – cancel this as well using the same small x in the iTunes status window.
8. The first stage in the restore process unlocks the iPad, you are basically just cancelling out the restore process as soon as it reactivates the iPad.
If done correctly, you will experience no data loss and the result will be a reactivated iPad. I have now tried this with about 5 iPads that were locked identically by students and each time it worked like a charm.
~~~~~~~~~~~~~
Try it and good luck. You have nothing more to lose if it doesn't work for you.
 Cheers, Tom

Macbook air locks up instead of standby. Cannot wake with screen black and no sound. Have to hold power button for total restart. Happened with Mountain Lion and Maverick

I've had this issue since first buying my MBA mid-2013. Instead of going to standby, which works 98% of the time, every now and again it appears to go into standby with the screen black, but no amount of key pressing or mouse moving will wake it up. I am forced to hold down power button for a manual restart and faced with losing work. This problem has occured whilst using Mountain Lion and still occuring since updating to Maverick.

GoreLeech wrote:
Hello,
Having searched high and low, I can't seem to find a solution to my predicament.
Sun Feb 13 20:50:44 2011
panic(cpu 0 caller 0x9f8bfa): NVRM[0/1:0:0]: Read Error 0x00000100:
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Hi there, GoreLeech,
as per above extract from your error log, you have experienced a kernel panic due to problems with your Nvidea GeForce GT 330 M graphics card that has a 256 MB memory.
This may be due to the card not having enough memory for what you are doing, the only thing, I can suggest here is to call Apple, and get the machine checked out. You can run the Apple hardware test at home but I'd recommend getting it booked in with Apple. What is worse: A computer that randomly malfunctions, or doing without it for up to one week (often they repair it within a day!)?

A black screen come out, pass the power button to should down. (Intel i7)

_*Every times*_ when I click to download a *Windows exe file (.exe)*, a *black screen* to tell me to pass the power button to *should down*.
_*Every times*_ when I using *Parallels Desktop 5 for Mac*, I'm at the Windows XP starting up, and has a *black screen* to tell me to pass the power button to *should down*.

I bring my MacBook Pro (Intel i7) to the Apple store, they said is the Norton Internet Security 4.1.0 causing that happen.
The Apple store said uninstall the Norton Internet Security 4.1.0 and wait for the new version.

Black screen, powers up without hitting power button

After 6 months my iMac G5 20" rev. B working fine (other than failing to sleep automatically - will sleep display but hard drive does not power down) I'm having problems. The screen goes black and I cannot re-boot: I get power but the screen either stays black or, sometimes, freezes at gray. I have repeatedly tried resetting PRAM and PMS.
After 1.5 hours with an AppleCare rep, with no success starting the machine, I took it to my local Apple Store and (of course) they were unable to replicate the problem, although they did run Techtool on it all day and found no problems with either the hard drive or the memory. (I'm a little ticked that they didn't even bother to read the notes from the AppleCare rep - the attitude seemed to be that neither the AppleCare rep nor I knew what the heck we were talking about.)
So I took it back home and lo and behold it did start up normally. So (after backing up my files) I did a complete erase with only stock Apple programs reinstalled. It worked fine for a few hours but then the exact same thing happened: black screen, unable to start up although I get power (the screen stays frozen at black for about 60 seconds, and then the fans come on full speed which I understand is because there's no OS running to regulate them). Only now there's one new development: whenever I plug the iMac back in - whether by pulling the plug out of the back of the unit, or unplugging the cord at its far end - the computer automatically powers up without my pressing the power button. That happens even after I've used the power button to turn it off. That seems weird as well as potentially a safety issue.
I have it in for servicing again - this time, to the local reseller I bought it from, because they don't require an appointment and force you to wait around for hours merely watching them run Techtool - after another hour-long session with an AppleCare rep was unable to get it working and the rep said it was "definitely" a hardware problem. I'm just wondering if anyone else has had similar issues: especially the "powers on without pushing the power button" phenomenon.
I have 2G aftermarket RAM but don't think that's the problem because the same issues occur regardless which RAM stick is in the machine, even after resetting PRAM and PMS and doing the system erase and install. Also, the Apple Store did test the memory with Techtool and said it was fine.

After again experiencing problems I took the iMac back to the reseller where I bought it. They were able to replicate the defect and I received a new logic board. The invoiced cost (covered by warranty, luckily!) was $1,067 for the logic board and $85 for labor. The hard drive was erased but OSX Tiger was pre-installed when I picked up the computer. (BTW, Backup 3 is a very nice backup utility!) Now my iMac seems to be working perfectly, and the energy saver/sleep function works normally again.

Unable to close Safari pages. Have to hold power button to close out.

This has happend 3 times now within the last week or so. Everytime it has happend, I was on "Myspace" and had other pages open. The red close button and the Home button are faded when this occours. The only way to close out is to hold the power button until it shuts off. Any thoughts would be greatly appreciated! Thanks!

Welcome to Discusssions - have you tried to Force quit Safari? Either go to the blue apple in the menu bar and scroll down till you reach force quit and select Safari, or go to the Safari icon in the dock, click on it and select force quit.
Once you have done that, you might want to empty the Safari caches and delete the history. You should also go to User>Library>Preferences>com.apple.Safari.plist and drag it to the trash.
Please let us know how you made out,
Miriam

When i click on my external hard drive the screen goes dark and a msg pops up saying i have to shut down my computer by holding the power button and then restart it. when i do that i get the same result every time. it worked perfectly last night..

when i click on my external hard drive the screen goes dark and a msg pops up saying i have to shut down my computer by holding the power button and then restart it. when i do that i get the same result every time. it worked perfectly last night..

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. Click Utilities, then Console in the icon grid.
Ifou don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the interest of privacy, I suggest that, before posting, you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if it’s present (it may not be.)
Please don’t post other kinds of diagnostic report.
I know the report is long, maybe several hundred lines. Please post all of it anyway.

HT201401 What causes the iPhone 4S to shut down to a black screen when it has full power?

What causes the iPhone 4S to shut down to a black screen when it has full power? I have cleared the open icons and it works for one day then shuts down again.

Software hiccup, glitch or maybe faulty battery. Restore iPhone with iTunes on computer. See if this helps. If still problem that you think is serious enough to fix, all iPhone 4S have full Warranty. Make Genius Reservation and take iPhone to Apple for resolution.

MacBook Pro stuck in sleep mode: can't restart or shut down, black screen

I'm running the latest version of Snow Leopard on my mid-2009 MacBook Pro Unibody. After installing the latest Software Update, including a Firmware update for my SuperDrive, the following problem has occurred, for the very first time:
I closed the lid of my laptop for the night, as I do routinely every night, thus putting my MBP to sleep. I leave the various apps open, usually Firefox, iTunes and Entourage. The next morning my MBP felt hot and the screen remained black... it would not change. After repeatedly trying and failing to clear the black screen and bring my apps up, I held the power button down to do a complete Shut Down. My system turned off, but did not do an actual Shut Down. When I press the power button to turn it on, it comes right back into sleep mode with the screen remaining black. I cannot seem to force either a Shut Down or a Restart. I unplugged all peripherals and the power cord, let my MBP cool down completely--for a couple of hours-- and tried everything again. Still no change: I'm stuck in sleep mode with a black screen. I've also tried resetting the PRAM and the SMC, but neither works, probably because I'm not coming from a Shut Down. Is anybody else having this problem? Anyone have any suggestions? I think the problem must be somehow related to the latest update, but whatever it is, I'd like to resolve it.
Thanks in advance for any help.

I can't get into my system to see my update version, but I'm certain I'm running the most up-to-date version of Snow Leopard and all other latest updates applicable to my mid-2009 MBP, as I run Software Update routinely. I thoroughly completed all update installations, including the SuperDrive Firmware update, followed all instructions meticulously, including rebooting, and actually used my system for at least one full day without any problems. I'd even recently repaired all permissions. Everything was "humming" along very well. This problem came totally out of the blue. Because the screen is black, I can't actually see what's on it; however, I've put my MBP to sleep every night by closing the lid and it awakens in the morning when I raise the lid. This time the sleep light indicator is on, but nothing happens when I lift the lid, touch the track pad or a key. If I hold the power button down briefly, the sleep light goes out, but when I press the power button again, the light comes right back on. If I depress the power button for several seconds, to initiate a shutdown or restart, it simply shuts off the fan and refuses to completely shut down. This is evidenced by the fact that depressing the power button to start up brings the sleep light on very quickly. I can tell by the way the system sounds that it is on behind the blackened screen. Sorry I can't get you the update versions.
Thanks

I have a mac book pro running Lion 10.7.4 and every time I use Google Earth The computer crashes by lowering a black curtain and then asking me to hold the power button down until it closes and press the power button again to restart it. Can I fix this?

I have a mac book pro running Lion 10.7.4 and every time I use Google Earth The computer crashes by lowering a black curtain and then asking me to hold the power button down until it closes and press the power button again to restart it. Can I fix this? It bugs me when I'm looking at real estate.

I really don't have an answer for that one. I guess that while trying to get things working correctly, I would use the most basic monitor I had which in your case would be the Eizon using the Thunderbolt port and adaptor.
When you boot into Safe Mode the startup is quite slow, but you should get the Apple logo and then the spinning gear below it (release the SHIFT key when it appears.) Then after a little more time you should see a gray progress bar appear below the spinning gear. When that disappears the computer will startup to a login screen.

IMac keep shutting down black screen then have to hold power button down then turn it on again i did this 4 times in all of a period of 5 minutes what to do ??

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