System did not start up help

I have had my computer for around 6months it is the first computer i have ever built
the specs are

CPU: i5-3750k
GPU: Evga gtx670 ftw
MOBO:ASRock Z77 Extreme4

The problem was that when I pressed the on button to start up my pc nothing happened except the little light where the Ethernet cable plugs into turned on like it normally does so I held down the on button untill the light turned off ,waited a bit then flipped the power switch to off, opened my case, and wiggled the cable that connects my mobo to the psu and made sure it was in right then i flipped the power switch on and my computer turned on just fine like it normally does no problems then i started thinking if it was just that cable that connects to my mobo then why didn't the fans turn on and why did the Ethernet cable light turn on

so i wanted to know why this happened and if i was at risk for any thing

also am I suppose to flip the switch on my psu to off every time I turn my computer off?
4 answers Last reply Best Answer
More about system start help
  1. No need to touch the PSU, just use the power button and your good
  2. Thank you for the reply that has been bothering me since day one after i built my pc.
    what about the other stuff is that normal?
  3. Best answer
    I like to call it a PC fart. Things just get loose every once in a while.
  4. Best answer selected by robotsdidyourmom.
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