I have an older 2 x 3 GHz Dual-Core Intel Xeon with 3 GB 667 MHz DDR2 FB-DIMM. It always seems kind of loud, though sometimes out of nowhere, the fans kick on real loud, like a plane is about to take off, and out of nowhere the screen goes black or it freezes and I have to cut the power and reboot. Also, one of the drives I have inside of it does not mount, it did this previously and I had to unplug it and reconnect it and it showed up. I am also getting some random lines that appear on the screen and go away. 1. Anyone have any ideas what is going on? Am I having hard drive failure? Graphics card failure? Thanks!