Try to remove the rams if you have 2 rams on your PC try to remove one and if this problem continues follow this steps below
STEP1 - Try to put an old video card
and tell me what happens if this not work follow this step 2
STEP2 - Verify your specs DDR
, if your specs is not having the same DDR
you need to buy all specs of same DDR. and if this method is not working follow the step 3 is 100% working BECAUSE I tryied
STEP3 - Go your computer to an assambler.