This is really weird. I don't know what happened but I already shut down my computer and the fan is still running. This is the first time that I encountered this problem. The fan won't stop unless I remove the plug. Any idea why it happened?
I think it cause of your BIOS update. The fix is to restart the computer, hit ESC. Scroll down to BIOS Setup. Then use the arrow keys to go to the Exit Screen. Scroll down and select Load Default Settings. Then hit F10 and Save. Afterwards, the fan will simply quiet down, but not turn off. This is a temporary fix until system puts out a fix.
u you can check it by connecting black and green wire. if fan running it is ok. if not have problem on powersupply.
I Think there is too much dust in your fan . Try to cleaning with clean and dry brush.Check your fan socket to make sure the voltage is enought for this fan.