Hi Tim, would you happen to know the specification of the RAM stick that you added?My Lenovo Ideapad 310 accepted a 2Gb ram in that 2nd slot.
I have tried two identical RAM sticks, same as the one attached to the Motherboard with no success, albeit Lenovo say the Maximum RAM which can be used is 12Gb.,
Do you have an hardware program like "HWINFO64" (which is free) to confirm whether your memory's "MODE" is single channel or Dual channel ???.
Regards, John P.