Computer won't power on
Hey, so I built my second computer and I've plugged everything in correctly, the power supply, cpu, harddrive is connected and everything, graphics card is hooked up, etc. Now when I turn on the power supply the LED for the power button glows, but when I push the power button nothing happens. None of the fans start, no noise, nothing. Is there any other info I should give for assistance? Thanks for any and all help.
CPU: AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor
GPU: SAPPHIRE 100283-3L Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card
Power Supply: APEVIA ATX-TL450W 450 Watts ATX12V Power Supply - OEM
Motherboard: MSI 880GM-E41 AM3 AMD 880G HDMI Micro ATX AMD Motherboard
Sorry my hard drive is one I used on my old comp and I don't remember what make it is.