Laptop not booting after ram upgrade

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So, I have a Lenovo y500. I wanted to upgrade from the original 2x4gb RAM to 2x8GB ram, so I ordered a Corsair Vengenace 16gb kit. Compared to the stock ram I had(which were ddr3 1600) the new ones are 1866 and ddr3l. Naturally, I've researched before ordering this particular kit and it should be compatible by all means, but as you can guess it doesn't boot.
(CORSAIR Vengeance Performance 16GB (2 x 8G) 204-Pin DDR3 SO-DIMM DDR3L 1866 (PC3L 15000) Laptop Memory Model CMSX16GX3M2B1866C10) -- this is the kit.

Any tips on how I should get it to work? For now I'm going to try putting in just one/half-half and see how it goes.

UPDATE: Okay, I tried with the corsair ram in slot0 and the stock in slot1 and it boots up. It displays 12 gb of ram. Here are the screencaps from CPU-Z http://imgur.com/a/FIa80. So the RAM themselves are confirmed as working, but for some reason the laptop won't boot when they are put in without a stock 1600 stick? I'm confused now. Is this something that can be made to work through some bios settings?
 
Solution
Might unplug, remove DRAM, remove battery, hold the power button for 30 seconds or so for a hard reset, then install DRAM, battery and plug in and give it a try

BadAsAl

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So I have to guess a little here but according to Crucial.com and a manual I found for that model, it only mentions DDR3-1600 as being the correct RAM. So what might be happening is when you have 1 DDR3-1600 and 1 DDR3L-1866, it is running at the 1600 speed but when you have both 1866 chips in, it is trying to run at a speed it doesn't support.

I would try looking through the BIOS to see if there is a setting to make it run the RAM at 1600.
 

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Yeah, I'm thinking that too. It's just that I read that the 1866 goes down to the supported speed and works fine. I'll try with just one 1866 stick. If it doesn't work I'll have to get a modded bios because the normal one doesn't have the necessary options to customize stuff like this.
 

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Could the reason be that I had a very old cpu chipset controller driver installed? I noticed that I had a very old one installed, and upgraded just now to the most recent one. I'm going to try later I think.