RAM ISSUE

I've got the Aurora R7 which came with a single 16GB HyperX Fury installed. I proceeded to purchase another 16GB HyperX Predator. The system powered up and it did show up a few times, but now I just get a plain black screen everytime I power on, with a solid blue LED(I'm assuming it's a no POST state). 

If I plug in just a single stick(either the OEM or the newly purchased stick), the system comes on. But it will not come on if I plug both in. Also if I change the order on the slots - for example - I tried the Predator on Slot 1 and OEM Fury on Slot 4 - then I get the 2 amber LED flashes RAM error.

Also attaching a photo I had managed to grab of the screen when both were installed and showed up as 32GB. Have run Windows Memory Diagnostic on both sticks and they seem to be individually working fine.

 

SLOW BOOT ISSUE

ALSO, Dell has changed my motherboard twice(system is in warranty), and this has not helped. Their India tech support is anyway clueless. After they changed the motherboard today, it's now taking almost 20-25 seconds, before the BIOS splash screen(Alienware logo) shows up - before that it's just the no Post black screen. Any idea why this is the case? Can't find any info anywhere.