have problem ,pls help guys

Hi every1,
I am new on this forum , but i have big problem . while using my computer playing game / or surfing online my comp just stop working , nothing happens. sometimes , but SOMETIMES comes up blue screen and i try to read it but it only lasts for like 2 seconds so its inposibble ,and after that i just restart my comp and it works just fine.
and i rlly dont know if its graphic card problem or its my monitor ( i say this only cuz i have really old monitor 17 '' lg 1750sq )
graphic card : ati radeon hd 5750 1 gb

right click my computer select properties then choose advanced system settings click settings for "startup and recovery" under "system failiure" uncheck "automatically restart"

this way your operating system will crash rather than restart giving us some indication as to what is going on

if it bluscreens wait till the timer reaches 0 at the bottom of the bluescreen before you reboot

then after a reboot find your "minidump folder" c/windows and attach the contents to your next post