Ok TPu'ers here's one for you to help me with. First, see system specs for details. When I turn on my rig from a cold start, the ASUS logo screen appears and the rig sits there forever. The hard disk LED is on, but the hard disk is not doing anything (no seek or head movement sounds). If I turn off the computer and immediately restart it, it boots fine. The way I can tell is that after about 10 seconds when the computer will boot successfully, the CPU fan kicks into high (I have it set in the BIOS to full speed, all the time). If after about 10 seconds the fan does not ramp up, the computer goes nowhere. Putting the fan control on in the BIOS (quiet control or whatever it is called) doesn't change anything. Same problem. I have the latest (released, not beta) ASUS BIOS for my mobo. The system is not OC'd at all, and when it does boot it runs 100% stable, no crashes. I would normally think bad BIOS, but on restart it comes us fine. I thought maybe disk spin-up/timing problem, but that seems a bit of a stretch. The wierd thing is that this never occurred before I put in my new CPU cooler (in specs). There is nothing special about the cooler's fan connection or anything. There is nothing about the cooler's fan that should prevent booting. So ... give me your ideas on what you think it may be.