Screen flicker that freezes system, automatic restart without warning

Hi,
 i have a toshiba satellite l775 17 in laptop and sometimes the screen flickers that i will be unable to see pictures on the creen and also the system freezes causiong me tohard reboot the system.
another problem is the laptop restarts automatically without giving any warning sign. this occurs sometimes too.
can anyone assist me in resolving the problem.
thanks

Try performing a clean startup and then see if it still happens.
How can I perform a clean startup of Windows 7 without my startup items to troubleshoot a problem?
- Peter

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    0x98124000 - 0x9812cfff  libsystem_pthread.dylib (105.10.1) <4A229519-29A1-3ABF-8CEF-43BCE4ACDA06> /usr/lib/system/libsystem_pthread.dylib
    0x98adb000 - 0x98addfff  libquarantine.dylib (76) <9ADD861F-A66E-3AD1-A77E-C622E91BD203> /usr/lib/system/libquarantine.dylib
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    0x98c63000 - 0x98c89ffb  libxpc.dylib (559.10.3) <6C4CEB0F-0044-3B62-A286-5693C3FD239E> /usr/lib/system/libxpc.dylib
    0x993a4000 - 0x993a9ff7  libmacho.dylib (862) <48DE74F8-09E3-344F-A82F-665083A3BF8F> /usr/lib/system/libmacho.dylib
    0x99422000 - 0x99423fff  libremovefile.dylib (35) <49DCAF7B-4466-3775-9E58-EA5D7CBA8AE0> /usr/lib/system/libremovefile.dylib
    0x9a0c5000 - 0x9a0cbff7  libsystem_networkextension.dylib (167.1.10) <FC20E3AD-A53D-3346-AC71-829E82832AE8> /usr/lib/system/libsystem_networkextension.dylib
    0x9a482000 - 0x9a4b5fe3  libsystem_m.dylib (3086.1) <951F633F-57B7-398B-912F-F6ED4DB1C597> /usr/lib/system/libsystem_m.dylib
    0x9b066000 - 0x9b08fff7  libsystem_info.dylib (459) <4F7A7111-7F0D-3891-9DC9-41F5D79949FE> /usr/lib/system/libsystem_info.dylib
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