I took parts I had from a previous build and put them in a different case. Everything worked fine from it, but now it doesn't seem to want to work. When powered on, the cpu fan runs, the motherboard lights up, I can access the bios but it shows no hd or cdrom. The pc fan and cdrom show no signs of life. I have checked all the cables several times making sure they are connected correctly and not damaged, but they still don't seem to work. The cdrom worked the first couple boots, but after that nothing. All these parts worked together fine before so I'm not sure what the problem could be. Is it a power issue, the motherboard or just a dead drive?