Toshiba M645 laptop turns off without reason

I have been dealing with this problem for about 4 months. It has been seen by some technicians and never found the cause. Some thought it was due to the settings in the power options either by what the lid does, or when it should go to sleep mode, and disabled it, but the nobody fixs it. Sometimes it would happen a couple of minutes after starting it, so heating problems are not involved. Some other times I would be working on bat only and it does it once, I turn it back on and continues to run normal. Some other times, It shuts down like three times in a row, and for no reason stops doing it. One techinician said it could be motherboard problems, and I starting wondering why I bought a Toshiba laptop, if supposedly I was buying top of the line product, recommended by some friends, and now I beleive Toshibas are causing a lot of trouble. Specially if a laptop is just one and a bit year old.
I am really disappointed. Maybe some other owners of M645 can help me

When you say that it has been seen by some technicians, do you mean you returned it to Toshiba under warranty for service, or that you had it looked at locally by a 3rd party?
When it shuts down, is it a hard shut down where it just turns off, or does it go through a proper shut down? When you restart, do you get any error messages?
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Satellite Pro L350 T9900, GM45, 8GB RAM , Intel 320 SSD (my baby) Satellite L655 i7-620M, HM55, 8GB RAM, Intel 710 SSD (travel system)

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Muy mac turns off without reason

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Thread 10 Crashed:
0   com.apple.GeForceGLDriver               0x0000000200012010 gldAttachDrawable + 2528
1   com.apple.GeForceGLDriver               0x00000002000d63d7 gldUpdateDispatch + 14343
2   com.apple.GeForceGLDriver               0x00000002000d6c66 gldFinish + 646
3   com.apple.opengl                        0x00007fff808df26d CGLFlushDrawable + 67
4   com.apple.QuartzCore                    0x00007fff888ff303 view_draw(_CAView*, double, CVTimeStamp const*, bool) + 2980
5   com.apple.QuartzCore                    0x00007fff888fe708 view_display_link(double, CVTimeStamp const*, void*) + 64
6   com.apple.QuartzCore                    0x00007fff888fe64f link_callback + 219
7   com.apple.CoreVideo                     0x00007fff8324e0ab CVDisplayLink::performIO(CVTimeStamp*) + 431
8   com.apple.CoreVideo                     0x00007fff8324d310 CVDisplayLink::runIOThread() + 754
9   com.apple.CoreVideo                     0x00007fff8324cfe3 startIOThread(void*) + 139
10 libSystem.B.dylib                       0x00007fff82731fd6 _pthread_start + 331
11 libSystem.B.dylib                       0x00007fff82731e89 thread_start + 13
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Mini turning off without reason

Hi all,
I am a bit ****** today, since this morning my so far beloved mini stopped working. I just went of during a normal Safari session. I tried restarting everything without luck. After a while I figured out that unplugging the PSU from the wall outlet and waiting 10/15 seconds will eventually help. So I did and the mini booted up again. Tried to analyze the issue without luck.
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Hi
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Moderator Note; s/n edited for members own protection

Hi and welcome to the forum!
Tell us something more about your system, like installed memory size, processor speed, graphics card make and size, HDD size and so forth. Because yours is CTO model hence it's not possible to figure out these things without your telling us about them.
I'm not very expert but I would say it's probably the RAM since system board and HDD have already been replaced or possibly you have got a lemon. But try following suggestions first.
Do you get any sort of error message or Bluescreen? does Event Viewer report something unusual? Event Viewer can be opened by typing it's name in the search field in Windows 7. If you get Bluecreen you can view it via this program:- http://www.nirsoft.net/utils/blue_screen_view.html and let us know what it says.
Also, make a bootable CD of mem86 and run the test on your RAM, mem86 can be downloaded free from:- http://www.memtest86.com/
Lastly, you can burn LiveCD of any Linux distro and boot from it, if applications work fine in Linux environment then probably it's some software problem your thinkpad is having, re-imaging the system to factory state would be great initiative in that case.
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Maliha (I don't work for lenovo)
ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
IdeaPad: U350
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I like that third tag...
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Message was edited by: Vegabondsx
Message was edited by: Vegabondsx

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This procedure is a diagnostic test. It makes no changes to your data.
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syslog -k Sender kernel -k Message CSeq 'n Cause: -' | tail | awk '/:/{$4=""; print}' | pbcopy
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Launch the built-in Terminal application in any of the following ways:
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☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
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Toshiba M645 laptop turns off without reason

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