cpu over voltage error

Hi I have a cpu over clocking popping I put a new cpu fan cooler in like 2 weeks ago. I boot it sends me right into bio what could be the reason for this issue?

Hello! I recently installed a third hard drive. In order to get the new hard drive in its place, I had to get my ram out and I also had to unplug the power cables to all my other hard drives because they were in the way. When the new hard drive was in place, I put the ram back in its slots and...