help!! power supply problem

[AIMAN SNK]

my specs

mobo:ASUS P8B75-M LX
proc:INTEL G630
ram:8GB DDR3
g.card:MSI GTX 660 2GB TWIN FROZR
psu:COOLER MASTER EX2 525WATT

my question
I just bought PSU and MSI GTX 660
my power supply no power in 3 weeks
my motherboard CAN'T support or CAN'T Hold PSU OR MSI GTX660

OR WHAT CAUSE MY PSU DAMAGE????