My I MAC just goes BANG without warning.

I let my little nephew use my I MAC and next thing the power was off of course I blamed him - that evening the same thing happened to me - my mac just goes bang without warning - I restart it sometimes it will last for 2 minutes or it can run for a few days - I am kind of worried that one day it will not restart and I will lose everything - you would think the fan was struggling then it settles down - appreciate any help.

Hello, I have to say your story reminds me of my situation though I hope you have better luck. My iMac 1.8 20 incher started to act in the same way, just turning itself off at random times. I took it in for service, luckily my father works for an apple authorized repair center (20+ years of experience). They reported that the power supply was the problem and replaced it. when i got it back everything worked fine, for about 2 months. Then last Thursday it started shutting off again, and once i got it back in for service they discovered that the motherboard is fried, super fried. and not worth the $450 for a new board.
I have been an apple enthusiast for my whole life (27 years) and remain one. This is my first serious problem ever and I have to say that Im impressed that my mac lasted as long as she did, considering how much I use my machines.
So I say good luck to you and I hope your machine doesnt suffer the same fate as mine.
Joshu.

Similar Messages

It just shuts down without warning

Hi there,
My MacBookPro shipped on 06.2006 is shutting down without warning after more or less one hour when in battery use (The battery has 142 cycles). I've already reset and recalibrated the battery but without success. I also did the efi updates and the resend battery update also no success. The power level seams to drop rapidly without warning. The used battery is also not included in the apple exchange program (wrong serial no.). It is normal for a battery this age to have a power decrease but at least I’d like to get a warning before the computer shuts down. Please help me with your suggestions.

OK, first, let's be clear on this and all future posts: is the MBP running on battery (NOT plugged in) or is it pugged in. You can see that if it is NOT plugged in, then there could be battery issues and that's the first thing I would try to diagnose. There are several posts in this forum about that problem (which doesn't pertain to me or to esqjake, since our problems occur in both situations). If I can summarize:
1) download the latest software; if you have a MacBook (not Pro) you need to have a Battery Update. MB Pro's don't need this.
2) Check your battery life and charge, using System Profiler. In OS 10.4 there's info on Power; the Battery section looks like this:
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 4657
Remaining Capacity (mAh): 4330
Amperage (mA): 939
Voltage (mV): 12560
Cycle Count: 124
Apparently if the cycle count is under 300 and the mAh is low then you may qualify for a replacement battery. You'll have to search for yourself in the Forum for the exact numbers, sorry, since that's not what I'm experiencing I didn't write it down.
Now, on to the second type of problem: the MBPro shuts down *+without warning+* typically after being woken from sleep. Note that this is not a typical shut down; the computer just turns off. Also note, this is not a kernal panic, where the screen goes dark like a curtain is coming down and you get a polite message in multiple languages to hold the power key down to restart; no, the computer just turns off. Also typical is you have to hold down the power key for 5+ seconds (until you hear the tone and the power light flashes) or it won't restart; it will start for a few seconds and turn off again. Once I've restarted, it seems to work OK until the next time I try to wake it up; my current solution is that I'm just leaving it on. This has been called Random Shut Down Syndrome or RSS; you can do a search yourself if you have some time. Google will get you half a million hits or so (there's even a website called www.macbookrandomshutdown.com); there are far less in these discussion forums (and less help here, too, I've found. Doesn't Apple have an administrator looking at these posts?). Unfortunately, most of the hits deal the the MacBook, not the MacBook Pro. However, perhaps one of them will help.
Here's what I've found as possible causes:
1) a warped battery (mine isn't);
2) reset the System Manager Control (SMC)(unplug, battery out, hold down power key 5+ seconds, reboot);
3) due to overheating (again, it has happened immediately after waking from sleep, so it's the case is cool); or
4) there are some posts about looking through the console logs (Use the Console app located in the Utilities folder, and open console.log, console0.log, or consoleX.log). The console and system logs haven't been helpful for me personally (occasionally I've gotten the "previous shutdown cause= -82" message in the system log, supposedly a sign of RSS, but this is not consistent).
Now, here's something I found today, a simple test to see if you have RSS, but it is old and pertains (yet again) to the MacBook, not the Pro. However, I'll give it a try.
http://blogs.zdnet.com/Apple/?p=274
Anyway, I'm ready to bring mine in; I just can't afford to be without it just now. No data seems to be lost, so I'm just trying to get by, and put up with the RSS.
I hope that helps. Maybe some of the "Top Users" would like to help? I'm still lost.

HT201412 my Iphone 4 just went dead without warning and is not getting started even after putting it up for charging. Any Suggestions guys???

Hi
I have an Iphone4 and i am living in SA.
Today in the morning, my Iphone4 just went dead without any warning.
It is in this dead mode even after i tried charging it.
If i connect it to itunes, i find that the itunes is unable to detect the iphone.
And to my disappointment, i believe there is no apple store in SA.
Any suggestion guys???????

Try a reset:
- hold the home button and sleep/wake button down at the same time for atleast 15 seconds
- if you see the Apple logo appear rlease both buttons
If that fails try charging the iPhone while plugged into the wall adaptor and also while plugged into the computer. Try cahrging both ways for atleast 15-20 minutes. Also while its plugged into the computer check and see if the computer or iTunes will recognise that the iPhone is connected.

Mac is shutting down without warning

Hi.
Yesterday I suffered a freeze on my Mac pro (early 2009). After this, I couldn't boot from the original boot disc (verbose mode gave an error about a missing file called BootCache.playlist). Luckily (I thought) I have Time Machine and a second, cloned drive, so I booted from the clone and continued to work.
Overnight, I restored a Time Machine backup to the orignal boot disk, but this failed to boot also, so I continued to boot and work from my clone drive (this is a work machine, and I'm on a deadline). I decided to wipe my original boot disc, and use Carbon Copy Cloner to restore my boot drive from my clone drive.
This appeared to complete fine, however, this also refused to boot, and when booting with the Alt key held down, there was no recovery partition (just a somethine called 'EFI' something). So, continuing to work from my clone drive, my Mac suddenly started shutting down again – no warnings, just a brief freeze, then black screen, booting to the 'You Mac unexepectedly shut down ...' message. This happened repeatedly, usually about three minutes after booting up.
I've now resorted to reinstalling Mavericks (10.9.2) onto my original boot drive, in preparation for a TM restore – however, as a double-check, I thought I'd do a quick Disk Utility check on the original boot drive, seeing as my Recovery partition had now been reinstalled, and I get an error saying "The partition map needs to be repaired because there's a problem with the EFI system partition's file system." DU can't repair it though – it just says "Live file system repair is not supported".
Does anyone have any experience of this EFI warning / error, and is there any way around it?

HI Arthur.
I did think that the EFI warning could be a spurious error (I've had a few such errors before).
In desperation, I wiped my original boot disc, installed a fresh Mavericks OS, and then restored from TM, but from a backup before the original shutdowns occured (luckily I have multiple backups for my working files). I had to leave this restore over the weekend (it's my work computer), but it appeared to have worked this morning.
I've been very careful in what I've done since, trying to keep an eye on any processes, apps or combination of things that could trigger a shutdown, but – so far – I've not been able to replicate the issue. It may be that a vital system file became corrupted during my work or during the kernel panic – hence the repeated panics – but I don't see how that would explain the same issue on my clone drive.
I'm also being exceedingly vigilante for any signs of disc issues, just in case the EFI warning is an issue.
Interestingly perhaps, I was using Illustrator CC at the time, and I've had experience (or rather a colleague has had) of Illustrator files causing the Finder to freeze, so I wouldn't be surprised if it was Adobe / Illustrator / CC related. I also know that the graphics card in this particular Mac pro is a little buggy, and I've had GPU-related kernel issues in the past, too.
Hopefully the problem won't resurface, but I'll keep this thread open for a while, just in case.
Thanks again Arthur.

Satellite Pro M30 going down without warning

Hi,
My one year old Toshiba Satellite Pro with a Sigma Tel C-Major sound card DIES quite a lot of times when I begin a sound intensive application, such as Sound Forge, or Windows Media Player or a game like GTA Vice City or Return to Castle Wolfenstein and many more, the computer simply powers off, instantly. Dead. Without any warning. At that point something sticks in memory because it will not re-boot from the power switch.
Not without removing the battery and unplugging the power cord and then putting them back in again. This happens perhaps every third or fourth time but only with a program that plays music or some sort of sound effect. Can anyone help?

Hi Ken
this sounds a lot to me like your machine is overheating. I've seen notes in this forum that you could try clean the heatsink with a vacuumcleaner. Maybe this works for you - I don't know. But please be careful. If the fan gets running to hard from the cleaners air it might become noisy and even break.
If you cannot find a way to clean the heatsink, I recommend you to turn to an ASP.
Good luck
Tom

Mac Mini shuts down without warning, doesn't want to re-boot again

My mini is only 3 months old. I upgraded to 2 gigs of Ram when I got it (saved about a hundred bucks). It seems to be overheating and shutting down, problem is it happens all the time. When I try to restart it, I must wait until it is cold to the touch otherwise it will lock-up and I have to manually shut it down again. I have tried raising the mini up a little to try and get some extra air underneath but no luck. Should I take it back/get it serviced?

Welcome to Apple Discussions!
Is it just coincidence that several people are finding this issue arise at this point in time or has an update affected it (not that I've updated anything on it recently other than installing the new version of Inquisitor for Safari).
It's just coincidental I think - and given you've not updated anything, it is therefore not an update-related issue. However, the way the G4 mini's cooling system is designed, it's entirely possible for many things to potentially contribute to escalating heat issues in the system. In the first instance, the systems tend to collect dust and debris inside and around the vents as a result of the way the airflow is directed, so cleaning can be helpful. A strong vacuum cleaner used around the vents at the base and on the back can remove a lot of material and help system cooling. There's also potential for the CPU heatsink to become dislodged if the system has been opened or subject to movement or vibration, or for the thermal paste between it and processor to degrade, reducing efficiency of the heatsink. In addition, there's a thermal pad squeezed between the underside of the logic board and the base of the casing, designed to help draw heat from the CPU and dissipate it that way. The pad can deteriorate - it's a service part so can be replaced. Add to that the possibility for the fan to fail, and for any combination of the above to occur, and you have a number of scenarios in which an otherwise healthy Mac mini can begin to show thermal problems.
In your situation, I'd start by cleaning the system out. If you've previously opened it, I'd say do so again and take some time to ensure that all dust and debris is removed - blowing through the system can be sufficient for that. Also check the heatsink is secure and that when running, the fan is actually spinning. If you haven't previously opened it and don't want to try, try the vacuum cleaner method on the vents to see if that helps.
If those steps don't help, then it becomes increasingly likely the system needs some service attention, and the thermal pad and paste become likely culprits.

My mac keeps shutting down without warning

Can anyone help. My imac will suddenly turn itself off, this happens when I am not online and I can start it again immediately.

What model iMac do you have? G3, G4, G5, Intel-based? How old is it? What OS are you running, 10.3, 10.4, 10.5, 10.6, etc.
It sounds like your power supply is going bad. Here's a link to an old discussion with a similar sounding problem:
https://discussions.apple.com/message/1938289#1938289
This may or may not be a repair that you can do yoourself, depending on you iMac model. I've never had to do this repair so I can't help you out that way.
Good luck.

MacBook shuts down without warning during calibration (39% battery power)

My MacBook has been shutting down without warning during recent calibrations (which I've done approximately every two months). Most recently it shut down after 2 hours and 20 minutes on battery power with a battery reading of 39% -- i.e., nowhere close to the 0% of a fully rundown battery.
The result is that:
I'm not seeing the 'low battery' warning dialog before the computer shuts down; and
(ii) I'm not able to save current work and close all applications when the battery's charge gets low, before the computer goes to sleep (because it just shuts down without warning)
Can I do anything about this? Is it just an unavoidable indication of declining battery performance?
My MacBook is 15 months old. Current 'battery information' is listed below.
Thanks. Replies appreciated.
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 4792
Remaining Capacity (mAh): 4790
Amperage (mA): 0
Voltage (mV): 12477
Cycle Count: 23
------------------------------

stevenray1 wrote:
1. I'm not sure how to match the path you listed re: the '1.3 battery update' to what's on my MacBook. Maybe I just don't understand how to interpret it, but I don't have a root folder (or any other folder) identified as 'MacBook.' When I used Spotlight, I also didn't come up with a BatteryUpdater.bundle. A file named BatteryUpdate2007001.pkg was all that Spotlight turned up.
On my MacBoook my hard drive that I boot from is named Mort's MacBook. Yours may be similar I don't know. It is the drive you boot from. Mines shows in finder as the top level drive. The next level in column view. Then you find the System file and go from there.
If your not sure what you named your drive or which one it is click the apple in the upper left corner and then pick *About This Mac* You then should see *Startup Disk* and next to that the name is what you refer too when you look for the folder path I gave.
2. You recommended resetting the SMC. However, the info file you provided a link for says it shouldn't be "necessary except as a last resort in cases where a hardware failure of the power management system is suspected." Does that accurately describe the condition I reported? Also, the problems listed as possible reasons to reset the SMC don't include the one I posted about.
The reason I suggest resetting the SMC is that your changing one of the components that is controlled by the functions of the SMC. The battery is a big part of the system which the battery update changes. To get it to be sure to recognize the new bundle you reset the SMC. The instructions linked are not all inclusive but if you don't want to reset it that is up to you.
3. Similarly, re: the 1.2 Battery Update, it's not clear to me that any of the listed 'symptoms' of a faulty battery apply in my case -- unless what I reported indicates a "+low charge capacity/runtime+." Does it?
The battery update instructions are again not all inclusive. If you don't want to do it that is fine. All I know is you have a MacBook Pro update installed at the moment. You don't have a MacBook Pro. This suggestion of mine has helped many people with problems as reported by you. You do not have to do anything you don't want. That is your choice. Is your battery cutting off at 39% considered normal operating or capacity to you? I personally would call it a faulty battery, but thats just me.
What would be your definition of a faulty battery?
4. Apparently, you had a faulty battery which Apple replaced. I wasn't sure from your message whether you had other things going on that made it clear you had a faulty battery, or only the same symptoms I reported. Were there other power-related problems in your case, or only, as you wrote "the same thing as yours except mine cut off at 28%"?
I guess I misunderstood your original post, everything yours was doing mine was doing except mine cut off at 28% not 39%. I can only give advice on what you post. Are there other things happening that you didn't mention?
My idea of a faulty battery must be different than yours. If I don't get warnings I should and the battery does not work like it used to then that is a faulty battery in my opinion.
If your not comfortable with any of my suggestions contact Apple support and maybe they can help you. Possibly one of the other posters on here can give you different advice that you agree with. Never do anything advised in the forums unless you agree with it.

TouchSmart 610-1115uk Randomly Shuts Off Without Warning

i have had this TouchSmart for about 2 years now and it is in immaculate condition. physically apart from dust, which i clean out regularly, you'd be mistaken for thinking it was new. in terms of operation i have always been careful to look after it too, running regular scans of the HDD and hardware, updating drivers and being careful when it comes to what i download.
i have recently upgraded to Windows 8 Pro x64 (within the last 2 months) but didn't do a clean install, i simply upgraded from Windows 7 Pro x64, and to be honest after a few tweaks the computer was working better than ever, it was faster both running programs and in terms of startup time, and graphics looked better than ever.
then about 2 weeks ago it just shut off without warning, not shut down like if you'd asked it to, but just went blank like loss of power, i powered it up and it didn't do it again for quite a while and so i assumed it was a one off. but it soon started doing it regular. i've gone through every thing i can possibly think of trying to diagnose what the problem is, i've checked all wires and connectors, cleaned out all dust and checked for overheating, updated drivers, removed the extra RAM i'd installed not long after purchase, wiped the system and reinstalled Windows 8 from scratch, deactivated Threading on the CPU, and have reduced power to the CPU down to 50%.
this last action did reduce the frequency of the shut off issue significantly but it just seems completely random, i can be running any number of programs and it can work fine for hours, and then i can be doing nothing on it and it will just die.
i have run no end of diagnostics on it and they all say everything is fine, no viruses, no errors and no build up of heat (i've monitored the temperature rise when running and it never gets over 40 now with the CPU power turned down).
please can someone tell me if i'm missing anything, and if i can solve this without HP as my warranty ran out a few months ago, thank you.
updated: the shut off problem seems to occur more often when the computer isn't really having to process very much like when it is left idle or when i'm just using the internet, whereas if i play a game or use a resource hungry application it rarely happens.

I'm going to reply here just in case someone else happens upon this post and wants a definite answer like I did...
My Problem
My computer randomly shut down as if the power had gone out. I didn't shut it down on purpose, hit a button, put it to sleep nor was it running updates and needed to restart... it simply, shut off. It shut off much like the power goes out in a home, however all of my lamps and other electronics in my room were on. It was only my computer that shut down.
I followed a lot of advice in the forums and it did turn back on a few times but only for a few minutes before turning off and never coming back on.
I feared it would be the motherboard but a friend informed me it could be the Power Supply (the brick) and I saw THIS post and thought... it has to be that... or at least I HOPED it was that... or I was switching to Mac.
Never heard a response back to my reply to this post, and I didn't see a follow up to the guy above seeing if it worked for him.
The Solution
I decided to go ahead and purchase the power supply part for my computer which is the HP TouchSmart 610-1130f All-in-One series. It needed to be a 150W (hard to find but is sold in the HP Parts store).
This is the part info: 609919-001 In stock Powersupply - Madeline-R 150W 19V EPS2.0 Shasta
Upon receiving the part and plugging it into my computer, it worked. That was 9 hours ago (currently using fixed computer) and it is running just fine. I'm STILL holding my breath and hoping it doesn't go out again. If it does I will come back to the forum and let everyone know.
Hopefully I won't be back again in 2 years to purchase a new part. Lucky it wasn't something worse like the motherboard... having a computer that only lasts 2 years?
Anyways. Thought you should know random person reading this. Best of luck.

U410 (i5) Turns off randomly without warning

Hello
I just purchased brand new U410 for my sister. On the first day it turns off without warning, multiple times, but then it survive without any incident for hours until I shutdown it properly. I thought it was faulty driver and the bundled windows 8 need an update. I updated the windows 8 and installed all the driver available on Lenovo Support website. Well it runs perfectly fine for few days, then I give it to my sister as a birthday present. Yesterday she use it for the first time for browsing the internet and creating presentation then the U410 just turned off without warning. She turned it on but after few minutes, it's turn off again, repeatedly. She gave up and cry. As a brother who gave her the laptop, I have to responsible to make it works.
Next day I try to use it for work, and it's happen again, turned off without warning multiple times. I decided to take it to store where I purchased it. It works normally perfectly and smoothly without any trouble. i felt like a fool. Then when I get back on my desk, use it for few minutes then it turned off, again and again.
I'm not an expert on computer technology, I'm just a basic user. I read the other forums, they said it can be solved by re-install or tweak something, honestly I don't have that capability. Taking it back to Lenovo Service centre is difficult, I live in rural area in Indonesia with limited internet and transportation support.
I have try to change the power management and nothing happen, it just turn off suddenly. I've spend more than 24 hours downloading drivers for nothing. I need help and already desperate. Lenovo? Help.
PS. My laptop is U410 bundled with Windows 8
Serial Number QB06157482
In the box there was only the laptop and charger. Nothing else, not even a disc or thumb drive.
Sorry for my poor english.

CPU temperature is completely fine.
Try updating the chipset from Intel here: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&ProdId=816&DwnldID=20775&ProductFamily=Softw...
Also update the Intel Mangement Engine Interface from Lenovo here: http://download.lenovo.com/consumer/mobiles/0wme03w8.exe
Finally, update Intel HD graphics drivers from Lenovo here: http://download.lenovo.com/consumer/mobiles/0wvg09w8_64.exe
Also reinstall Energy Management Software here: http://download.lenovo.com/consumer/mobiles/em8.0.2.3.exe
Lenovo Y470: i7-2670QM | 8 GB DDR3 1333 MHz RAM | Nvidia GeForce GT 550M | 500 GB 7200 RPM Seagate HDD | ASUS PCE-AC56 802.11ac Network Adapter | Windows 7 Professional 64-bit

Computer turns off without warning on battery power

Starting a few weeks ago I've found that my Macbook Pro has been turning off without warning while on battery power. The first time this happened it was after about an hour of use and now it happens within a half hour or less. If I try turning it back on it shuts off before OS X is fully loaded. According to CoconutBattery my battery's health is at 97%, so the battery isn't losing overall charge capability. When I'm on battery power it says I have 2-3 hours of battery life left. Sometimes I notice this will drop between 1-2 hours after 20-30 min of use (if it'll stay on that long) but it never drops and gives me a warning of low battery. It just shuts off without warning. If I press the button on the battery after this happens I do get 4 out of 5 lights. This never used to be a problem. My computer is 14 months old. I've replaced the battery once about 8 months ago (under warranty) because my original battery was losing capacity very quickly. Because 14 months have passed I can't simply get a new battery under warranty. According to Cocoanut Battery and the Finder my battery should last near it's full capacity. I can't figure out why it's randomly shutting off. I have had all the latest updates including the recent battery patch. Any help would be greatly appreciated. I will award "solved" for a solution and "helpful" for posts that contribute to the solution. thanks!
Message was edited by: Vegabondsx
Message was edited by: Vegabondsx

Because 14 months have passed I can't simply get a new battery under warranty.
Actually (and fortunately), that's incorrect. Apple extended the warranty for all Core Duo notebook batteries to *2 years* from date of purchase. Details are here:
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Your full charge capacity is fine (as you noted). But one of the symptoms listed on the linked page is +"Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count (as shown in System Profiler) of less than 300."+ The word runtime in there applies, so I would call Apple or make a Genius Bar appointment and head into a store. (I did the latter, they replaced mine - free of charge - 15 months after purchase, no AppleCare, and no hassles).
Hope this helps...

I recebtly bought an app (FIFA 12) now every time i play a match after the match it does not save an just goes to the home page without warning and i have to start all over again and no i did not press the home button. plz help

i recebtly bought an app (FIFA 12) now every time i play a match after the match it does not save an just goes to the home page without warning and i have to start all over again and no i did not press the home button. plz help

You can't gift it, gifting can only be done from within the store, not from within your library.
Puchases are considered final but you can try the 'report a problem' link to contact iTunes Support and see if they will refund or credit you : http://reportaproblem.apple.com
If the 'report a problem' link doesn't work then you can try contacting iTunes Support via this page : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption

Mac pro keeps shutting down without warning

I have a 15 inch Macpro running Mac OS X Lion, version 10.7.3. It keeps shutting down without any warning. The screen just goes black and I have to press and hold the power button for a while till a hear a sound to turn the system off. This is happening like, more than 5 times a DAY. Please help, any suggestions are welcome.

Dose this issue happen when the computer is plugged in? or only when it's unplugged from power?
Have you checked for software updates? if so, have you installed all the updates? (apple menu, software update, install updates, reboot, repeate untill there are no more updates)
If the issue is happening while power is plugged in, have you tried a SMC Reset and NVRAM Reset?
Is there any thing externaly connected to the computer besides power? if so, haveyou tried removing those items; to see if the issue only happens while those devices are connected?
Do you know if yoru MacBook Pro has a NVIDIA GeForce 8600M GT? (apple menu, about this mac)
Do you have any kind of keyboard cover? if so, have you tried removing the keyboard cover, dose the issue still happen?
You could also try running an Apple Hardware Test. If it give you any error codes; I would suggest writing down the exact error message it displays.
Also it might be a good idea to set the graphic card to run on the high end card; and see if the issue still happens. (apple menu, system prefrences, energy saver, At the top there should be a check box along the lines of use best graphic performance at all time, check this box)

Macpro goes to sleep without warning and I have to reboot to get it back

my macbook pro goes to sleep without warning on batt and I have to rebootto get it back

Hello stephenmeyer,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
About Energy Saver sleep and idle modes in Mac OS X
http://support.apple.com/kb/ht2412
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Best of luck,
Mario

My iMac is less than one year old. Without warning, the screen suddenly goes black. It used to happen occasionally, but is now happening all the time without warning. What is Apple doing to correct the problem?

My iMac is less than one year old. Without warning, the screen suddenly goes black. It used to happen ocasionally, but now it happens all the time. Numerous people have posted about this issue. Why hasn't Apple solved the issue. For what I paid my computer, I expected more from the product than I have gotten. I was a PC person for years and most of my associates told me that I needed to get a mac...I am starting to regret having taken their advice.

Sorry you're having this problem.
A few years ago we had a similar issue on one of our machines, it was an early MacBook. Ended up being a cracked circuit connection on the motherboard. Changes in temperature caused the crack to expand and contract resulting in a shut-down followed by an automatic reboot. Sometimes over-and-over. I understood from AppleCare at the time that those symptoms could have also been any number of things including a intermittent issue with a powersupply.
If you take it back to the Apple Store at some point, I would ask them to have it run some CPU intensive tasks that closely resemble what you are doing when the screen goes black. It took us several try's to find the problem. Calling AppleCare each time to discuss it and troubleshoot before making the trips to the Apple Store really moved things along. In fact, it wasn't until the Apple Store had cracked the case from the inside that things kicked into a higher gear and AppleCare phone support sent out a pre-paid FedX package to send it to a refurbishing facility. Never a problem since and I know the people who have the machine today.
PS Can identify with the trip to the Apple Store, our closest one is in Knoxville, 2hrs from us.

My I MAC just goes BANG without warning.

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