Installed a second hard drive to my computer but when I plugged everything back in and switched PSU power back on, all it did was put power to the bluray disk drive. When I press the computer's power button nothing happens at all. I can't find any help online and am stuck with what to do. Any and all help would be much appreciated!
Unplug the drive you just installed and try it again. If it works without that drive chances are there is a short internally inside the hard drive.