Hi!  I recently upgraded RAM and SSD in 7 Optiplex 9010 AIO computers in my office.  All went great except for one.  After changing the hardware the computer won't turn on.  When putting in power cord the fans click off and on repeatedly but computer won't go further than that.  I messed around with different things and finally found that if I remove and reinsert one of the RAM sticks or the motherboard battery the computer will turn on once.  After turning it off it won't turn on a second time.  If I reinsert the RAM again it will then turn on once again.  Unplugging etc doesn't help, only removing and reinserting one of the internal components.  I'm stumped!!  Do you have any suggestions?  Thanks very much.