Random freeze problem

[srn]

Hello,
I have an very strange problem with my PC.I have bought the parts and conected everything and the pc was working without any problems for 3 months after 3 months when i switched my case from an old one to CoolerMaster 690 III after 7-10days after the switch it freezed once and i needed to do the hard restart(plugging the power or pressing the power button for 5sec) after the restart it worked normaly again, and again after 7-10days it did the same but this time it did it two times in 1h, it happend again yesterday it drives me crazy. I tried to run only on the SSD for 2-3 days it didnt make the problem then i put back my HDD which i use only to store games and music again nothing for 2-3 days then i reinstalled my windows 7 pro SP1 and after 10 days this happend again. I havent done any overclocks except after the 2nd freeze I used the INTEL XMP to run my ram on 1600MHz and CPU Turbo mode to 4.1GHz

I am suspecting that the motherboard got an problem but i am not sure, because of that i joined here to hear you opinnion...

 

 

Here is my PC Config:

Motherboard: ASUS P8Z77-V LX
CPU: Intel i5 3570K

RAM: 8GB G.SKILL ripjaws ddr3-1600mhz F3-12800CL10S-8GBXL

SSD: Samsung EVO 840 120GB

HDD: WD Black Caviar 500GB SATA3
Graphics: Gainward nVidia 650 1GB

CPU COOLER:Noctua NH-U12P
Case: Coolermaster 690 III
DVD: Asus DRW-2014S1T

PSU: Silverstone 700W 80 cert
 

 

EDIT: This usually happens while browsing, it never happend while playing a game.

[Karumu]

the CM 690II has one fan stock installed, have you got any more fans that you could throw in there to get more airflow

[srn]

the CM 690II has one fan stock installed, have you got any more fans that you could throw in there to get more airflow

Its the CM 690 III version it has 2 fans one 220mm and the 2nd is 120mm and i added one more 140mm, the temperatures are ok, this ussualy happens when i am using chrome or youtube, never happend in game

[Karumu]

Its the CM 690 III version it has 2 fans one 220mm and the 2nd is 120mm and i added one more 140mm, the temperatures are ok, this ussualy happens when i am using chrome or youtube, never happend in game

then the solution is simple! you just have to be playing games ALL the time  

 

all jokes aside i have no idea, sorry, good luck.

[dragoon20005]

swap browser and run youtube on firefox

 

see if it cause any freezing