text: HOWEVER I noticed NOW when I shutdown the PC the system never fully shuts down. Everything shuts off except for the case fans and LED lights on the Antec 1200 and CPU heatsink/fan stays on. The motherboard remains on and never fully shuts off. I am always having to force shutdown by holding down the PWR button every single time. At first I thought it might of been the fan overtime feature in the bios, however upon disabling that option the system still remains partially on when shutting down.
  Before when I plugged the USB 3.0 into the motherboard it DID still do it, but it was extremely rare. However it was only AFTER I plugged the header into the board that now it does it every single time. Either that, did I manage to damage my system when I knocked off the main connector half way when I was trying to plug the USB 3.0 header in the beginning? Any help is appreciated. Here are the things I have tried so far in resolving this problem with no success.
  -made sure all devices in device manager had the checkmark unticked for: Allow the computer to turn off this device to save power"
  -turned off the PSU back switch then unplugged the power cable then turned on the switch and put back the power cable to see if the motherboard had to discharge something.
  -Have checked the bios settings for possible causes to this, the only option that came up was "fan overtime" where the fans stay on for 1 minute before turning off the machine", that option was disabled and unfortunately the problem still presist.
  -loaded defaults in the bios (even though I never overclocked anything at all)
  -made sure all PSU "POWER" connections are seated tightly and securely into the devices, I even checked all modular connections on the psu itself.
  -I have tried shutting down the PC in SAFE MODE and unfortunately, this doesn't work either. The only difference is the monitor stays on also with the process 'shutting down' freezing.
  -Have taken off the USB 3.0 plug off the boards header and unfortunately the PC still doesn't shut off.
  -Changed video cards.
  By the way, I had forgotten to add, strangely enough when I do a 'reset' in Windows, the PC COMPLETELY powers down EVERYTHING then about 2-3 seconds later powers back up. I'm not sure if that'll help
  ASUS Z77 Sabertooth (bios v1206)
  i7 3770 3.4 GHZ (stock)
  Generic stock heatsink
  Corsair Vengeance 8GB 1333 MHZ (stock)
  SATA3 Samsung 830 SSD 250GB
  Radeon HD 4870 1GB