gskill support said:
Which slots are you using?
They should be in the grey slots. If that doesn't work, try them in the first two slots furthest away from the CPU, or the two slots closest. If they work in that configuration, it is a defective motherboard. Let us know how it goes!
Looks like a defective motherboard then
[CPU] [DDR3_4] [DDR3_2] [DDR3_3] [DDR3_1]
Installed in DDR3_1 and 2 (grey slots) originally - didn't work.
Then tried DDR3_3 and 4 (black slots) - didn't work
Now, I have the sticks in DDR3_1 and DDR3_3 and it's "working". 16GB recognised in Windows.
Until I get this issue sorted out (will get my motherboard looked at, still under warranty), what is the disadvantage of having the two RAM sticks installed in different coloured slots directly beside each other? Is it an efficiency issue, or something more serious?
Thanks for all your help guys. Really appreciate it!