The connector didn't pull out you did not Press the Release and pulled the plastic along with the connector. Remove the plastic from the connector and carefully press back onto board making sure you orient the connector so that the release key is facing the correct direction.  Then put the cable back. [URL]   [IMAGE] [IMAGE] [IMAGE]  
I was trying to track down a vibrating/humming noise in a Optiplex 9020 SFF desktop and removed the drive cage. When I went to reconnect it, the 2x2 power connection that connects the drive to the motherboard had pulled out of the motherboard. I connected the cable from the drives and just pushed it back on the pins on the motherboard, but the computer is not detecting any drives. Is there a certain way the 2x2 connector connects to the motherboard or is there a way to fix this? The motherboard has 4 pins sticking out of it. I have the black plastic connector that I thought would just sit on those pins and then the cable from the drive cage would connect to the connector. But when I connect it, no drives are detected. Any help is appreciated.
HDD ODD connector pull out of motherboard on 9020 SFF