Question pc constantly restarting when upgraded Ram for 8gb to 16gb

Jan 13, 2021
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i upgraded from 8gb ( crucial ddr 4 2133MHz) to 32gb (integral ddr 2400mhz, 2*16), the pc constantly restarts , not even to boot screen , when both or 1, 16gb card is in the slots , works fine with an old 4gb and a new 16gb ( there are only 2 slots) . I have tried all configs card wise. currently running on recognised ram of 20gb .
its not the ram cards , these are the second lot I've tried and a slower speed as recommended by crucial support .

i have an intel core i7 6700k cpu @4ghz
and a geforce gtx 1060 6gb graphics card

ive tried removing the cmos battery to change the clock speed - which is currently 2133mhz, and is set to auto , i cant get to the boot screen when the 16gb cards are in place without the old 4gb. could it be the graphics card ?, and how would i check this or work around it . Thank you .