|It's extremely rare for ram that worked fine previously in the same mboard to go "BAD".|
However, it can have a poor connection in it's slot(s) , or if your install ram that wasn't installed in the mboard previously in the same mboard it may not be 100% comptaible, and in that case in some cases the computer may not boot normally.
Dell™ Inspiron™ 8600
See Solving problems
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1: