Will my power supply be compatible with my computer?

I currently this power supply:
OCZ Z-Series 550W 80+

I dont know if that power supply is enough to power my system cause when i turned it on, i dont see anything on my monitor. Thanks!

And the parts i already have are:

Video Card
Galaxy GeForce GTX460 Super OC 1GB

Ram:
Corsair: TWO (2x) 2GB DDR3 SDRAM.

CPU:
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX

MotherBoard:
ASUS M4A89GTD PRO/USB3 AM3 AMD 890GX HDMI SATA 6Gb/s USB 3.0 ATX AMD Motherboard

DVD Drive