My case is acting erractly - blinking lights, powering off, etc

Erratic behavior such as this indicates you may be drawing more amperage than the case provides on one or more of its power rails. Using modulargrid.net, you can check the power requirements from each module and compare the total current draw to the maximum current supplied by your case. If you are very near or over the maximum current provided on any power rail, you will likely need a new case with more power.