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Ram problems - Alienware aurora R4, Pc will give black screen if ram is on DIM SLOTS 2 and 4

My setup is : 
Alienware aurora r4

Operating System
Windows 10 Home 64-bit

Intel Core i7 4820K @ 3.70GHz Ivy Bridge-E 22nm Technology

3071MB NVIDIA GeForce GTX 780 (NVIDIA)

238GB Samsung SSD 840 PRO Series (SSD) 
931GB Seagate ST1000DM003-1CH162 (SATA) 

I purchased 2* (2x4gb) Corsair vengeance pro 2133 mhz.... what i didnt realise was that my cpu supports up to 1866mhz...

When i plugged all the sticks though my pc run normally run reading all 16gb (i imagine it autodowngraded down to 1866 or maybe lower? i m not pc expert, just taking a guess).

Now a year later, i removed the sticks because i wanted to check if my pc would run on 3 sticks ( dumb reason but i had an argument with a friend) ..... and now no matter what i do... my pc will only read the sticks on dim slot 2 and 4.... if i plug a stick either on slot 1 or 3 or all 4 slots, the pc will normally boot, but the keyboard and monitor will not run. ALL FOUR sticks run normally on slot 2 and 4 (so sticks aint damaged)

Anyone got a clue on what is going on ? or is there a way i could downgrade manually and set the bios read all 4 slots on 1866 or 1600 or whatever ?

thanks for the help !

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