right, first thing you should do is check your SATA cables and check to see if the HDD is still being detected in the BIOS
This is likely the case but jsmithepa is also smart in suggesting that you go back to the original configuration and try booting then. That way you can rule out that none of your parts are causing the issue.
I haven't gotten the error you are getting when installing RAM before since usually RAM only causes issues if it is different clock speeds, brands, etc, but this was on older machines that I would work on at work. Not sure if modern RAM has this problem but I also haven't tried putting different clocked sticks in a modern computer before.
right, first thing you should do is check your SATA cables and check to see if the HDD is still being detected in the BIOS
This is likely the case but jsmithepa is also smart in suggesting that you go back to the original configuration and try booting then. That way you can rule out that none of your parts are causing the issue.
I haven't gotten the error you are getting when installing RAM before since usually RAM only causes issues if it is different clock speeds, brands, etc, but this was on older machines that I would work on at work. Not sure if modern RAM has this problem but I also haven't tried putting different clocked sticks in a modern computer before.