Laptop keeps crashing. I have no idea why?

Well. I am glad that you finally got it sorted. Unfortunately, Memtest86+ does not always detect errors early enough, that's why I always recommend to let it run over night because the first test is sequentially test then the subsequent test includes a test which uses random test patterns, each pass these patterns will of course be different. Secondly some types of errors simply don't show up until the system has been running for a while or are very critical on a certain timing condition, are thermal in nature, or other such conditions.

Cheers !!!
 

My Computer

System One

  • OS
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Home Brewed
    CPU
    I7 4970K OC'ed @4.7 GHz
    Motherboard
    MSI-Z97
    Memory
    16 GB G-Skill Trident X @2400MHZ
    Graphics Card(s)
    NVIDIA GeForce GTS 450
    Sound Card
    X-Fi Titanium Fatal1ty Professional Series
    Monitor(s) Displays
    Dual HP-W2408
    Screen Resolution
    1920X1200
    Hard Drives
    256 GB M2 sm951, (2) 500GB 850EVO, 5TB, 2 TB Seagate
    PSU
    Antec 850W
    Case
    Antec 1200
    Cooling
    Danger Den H20
    Keyboard
    Logitech
    Mouse
    Logitech Performance Mouse MX
    Internet Speed
    35/12mbps
    Browser
    Firefox
Memtest86+ isn't 100% accurate - but it's the best test around. Read the documentation that comes with it for some ideas on further things to try.

When in doubt I also use Prime95 to stress the RAM - and it'll sometimes spit out errors when Memtest86+ doesn't.

FWIW - at work we run hardware diagnostics before anything else. It's a waste of time to try to fix software on a system that has hardware problems.
 

My Computer

System One

  • OS
    Win8.1Pro - Finally!!!
    Computer type
    Laptop
    System Manufacturer/Model
    Samsung/NP780
    CPU
    Came with the laptop (i7 of some sort)
    Motherboard
    Pretty sure that it has one, but haven't checked inside the case!
    Memory
    upgraded to 12 gB from 8 gB
    Graphics Card(s)
    has switchable - Intel/ATI - Used wrong drivers, now ATI card is inop :( Will have to fix it soon!
    Sound Card
    I'm nearly deaf, so this isn't used often
    Monitor(s) Displays
    Touchscreen on laptop/32" Toshiba on HDMI (laid the Sharp TV on a mouse and cracked the screen!)
    Screen Resolution
    800x600
    Hard Drives
    One Samsung 1tB drive - 5400 rpm. Gonna switch to a 7200/10000 rpm or an SSD (if I can find $500 for a 1tB SSD!)
    - Switched to 500 gB Samsung 840 series SSD - WOW!!!
    PSU
    Why do we ask this for laptops?
    Case
    Silver with a neat Samsung logo
    Cooling
    sub-par, gotta get around to working on it soon Worked on it - still sub-par! :(
    Keyboard
    Microsoft Natural - the same one I've used since it orignally came out around 1995
    Mouse
    no Mouse - Trackball!!!!
    Internet Speed
    too slow when I'm waiting for a download to finish
    Browser
    Yes, I use this (Firefox mostly, w/IE next most)
    Antivirus
    Windows Defender and Windows Firewall
    Other Info
    I'm handsome and a snappy dresser :0)
FWIW - at work we run hardware diagnostics before anything else. It's a waste of time to try to fix software on a system that has hardware problems.

Good point!
 

My Computer

System One

  • OS
    Win8 pro
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Computer 1 of 4
    Motherboard
    ASUS M4A78LT-M LE
    Memory
    4GB Kit (2x2GB)
    Monitor(s) Displays
    Samsung 18"
    Screen Resolution
    1080p
    PSU
    Cheapo
    Internet Speed
    30mb
    Other Info
    Computer 2 :~ Dell Inspiron - 1x 350gb & 1x 250gb - 6GB Memory - Win 7 | Computer 3 :~ Samsung 355v5C Notebook - 6Gb Mem - Win8 2Core| Computer 4:~ Samsung 355v5C Notebook - 6Gb Mem - Win8 4Core
I just thought I'd let you guys know that it was the motherboard and the fan that had to be replaced...
 

My Computer

System One

  • OS
    Win8 pro
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Computer 1 of 4
    Motherboard
    ASUS M4A78LT-M LE
    Memory
    4GB Kit (2x2GB)
    Monitor(s) Displays
    Samsung 18"
    Screen Resolution
    1080p
    PSU
    Cheapo
    Internet Speed
    30mb
    Other Info
    Computer 2 :~ Dell Inspiron - 1x 350gb & 1x 250gb - 6GB Memory - Win 7 | Computer 3 :~ Samsung 355v5C Notebook - 6Gb Mem - Win8 2Core| Computer 4:~ Samsung 355v5C Notebook - 6Gb Mem - Win8 4Core
Thanks for letting us know!
 

My Computer

System One

  • OS
    Win8.1Pro - Finally!!!
    Computer type
    Laptop
    System Manufacturer/Model
    Samsung/NP780
    CPU
    Came with the laptop (i7 of some sort)
    Motherboard
    Pretty sure that it has one, but haven't checked inside the case!
    Memory
    upgraded to 12 gB from 8 gB
    Graphics Card(s)
    has switchable - Intel/ATI - Used wrong drivers, now ATI card is inop :( Will have to fix it soon!
    Sound Card
    I'm nearly deaf, so this isn't used often
    Monitor(s) Displays
    Touchscreen on laptop/32" Toshiba on HDMI (laid the Sharp TV on a mouse and cracked the screen!)
    Screen Resolution
    800x600
    Hard Drives
    One Samsung 1tB drive - 5400 rpm. Gonna switch to a 7200/10000 rpm or an SSD (if I can find $500 for a 1tB SSD!)
    - Switched to 500 gB Samsung 840 series SSD - WOW!!!
    PSU
    Why do we ask this for laptops?
    Case
    Silver with a neat Samsung logo
    Cooling
    sub-par, gotta get around to working on it soon Worked on it - still sub-par! :(
    Keyboard
    Microsoft Natural - the same one I've used since it orignally came out around 1995
    Mouse
    no Mouse - Trackball!!!!
    Internet Speed
    too slow when I'm waiting for a download to finish
    Browser
    Yes, I use this (Firefox mostly, w/IE next most)
    Antivirus
    Windows Defender and Windows Firewall
    Other Info
    I'm handsome and a snappy dresser :0)
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