I just changed cases and power supply to a 600W up from a 400W and I can turn the computer on, but it won't turn off unless I use the switch on the actual unit. It says there is a signal from the monitor when I plug it into the computer, but it won't display anything. The graphics card isn't plugged in all the way into the PCi-E slot, but the fan runs on it when I turn the computer on.
TL;DR: HELP!
TL;DR: HELP!