may not be ram issue. the report of losing power before no post raises question of a household power surge? that triggered circuit breaker, or is it a community wide power outage?  beeps just suggest motherboard is not bricked, but may not point to memory.  if you have another desktop that accepts ddr4, test 3668 memory there, or give it to a friend to test for you.  Problem could also be psu.  problem is psu is proprietary.
Hello  Power went out, when i went to start everything back it seems it will start but not boot up. The on/off button flashes amber for a second, then a faint white. The power light below that flickers intermittently. The fans are kicking on but no beeps or sounds really.  Monitor is black like no signal but also oddly won't turn off.  Not really sure what the failure is,  has anyone experienced this or know what I'm looking at? Thanks 
Dell Inspiron 3668- help to identify failure?