No picture after adding two more RAM modules

I've recently bought two more RAM modules (2x16GB) from Corsair CMU32GX4M2C3200C16 for my ASRock Z370M Pro4.

After installing them I can't get any picture on the screen. If I remove all 4x16GB modules and install only new one everything works fine again. Even when I mix old with new ones everything is ok. The only scenario when it doesn't work is when I use all 4 modules. No beeps errors and fans are working as normal.

It seems like som kind of compatibility issue.
I've been using this motherboard for almost a year but with 2x16GB RAM and now it feels like I have to throw it away and buy a new one because its cheaper to buy a new motherboard for about 120 euro than replace all 4 RAM modules for 700 euro.

RLGL wrote: You need a matched set of 4 sticks. the 2 sets are not compatible with each other

Thanks for answer.

Hmm so basically I can mix one old RAM module with one new but I can't mix all 4.
This is strange. Can't Asrock just release some BIOS upgrade?

Its not a problem with the bios, if you use mismatched memory the system needs to find a common grtound for them to work together and if its impossibel because they are to different the system wont boot. This problem will follow you through about 95% of all motherboards, because they are not designed to use different mermory. If u really need to use different memory u need to make sure that every memory can run on the same speeds and timings. Also slotting your memory in correctly? Like the manual describes?

Unfortunately RAM upgrades are not as easy as they used to be. Even with the same model RAM kits you often have issues. Part of the problem is that RAM manufacturers will often change components within the same model family, they ran out of XXX RAM chips so they went with YYY RAM chips because they technically have the same specifications for example. This looks fine on paper but often leads to compatibility issues.