Home built problem

metro_2020

Distinguished
Aug 1, 2011
23
0
18,510
HI,
i have a problem with my new build i bought all the components and build my rig and its working.
*but few times my pc just turn off and restart again and a messege come at the desktop" unexpected turn off check for solution".they check but nothing
* some time i start my pc and it run the windows but before opening the desktop it again go to boot menu and automatically start the "CHK DSK".
i dont know whats the problem please help;
i did all the assembling , so i was thinking may be i put somthing wrong
Operating System -"windows 7 64 bit ultimate"
 

metro_2020

Distinguished
Aug 1, 2011
23
0
18,510
my configuration-
CPU- core i5-2500k
MB- Gigabyte Z68-XP-UD4
RAM- Corsair 12 GB(3*4GB)
CPU COOLER- Corsair H80
HDD- Seagate baracuda 1TB
PSU- Antac 1200 TPQ
Case- Corsair 400 R Graphite Mid tower
Optical drive- Asus DVD writer