Newly Assembled PC getting stuck

Hi all,

I've recently purchased computer components from snapdeal.com and assembled myself (details mentioned below). Right from the begining I'm facing this problem of system getting hanged and getting stuck. I don't run any major softwares.. Its a pain in the ass when I spend 30K for a good config and ultimately messing up everything. The system runs good till it runs but suddenly it gets stuck and have to hard reboot.

I would like you help in knowing which part should I be looking at to give it to service centre.

RAM: CORSAIR DDR3 8GB
MB: MSI 970A-G43
CPU: AMD 3.5 AM3+ FX6300
HDD: TRANSCEND TS128GSSD340 128GB SSN
COOLER MASTER 450W THUNDER

*Additional Hard Ds\isk of 320GB (Laptop Hard Disk, which is in its final stages)


In desperation of a reply. Thanks in advance.