I recently bought the phanteks p400 but have the rgb strip not working. I connected the rgb cable to an rgb header on my motherboard but once I connect my sata cable to the 12v power for the rgb to turn on, my pc turns on and then immediately off. I do not know the cause of this problem. I have a 500w power suppply but pc part picker rates my build at 289W.
One thing might be that the psu give problems or the cases sata connection to power the ledstrip gives a short. Does the hdd/ssd work fine? If so might it well be the cases sata cable and would returning the case probably be the thing to do.