I'm running a Dell XPS 410 Desktop with Vista. I originally had posted this in the forum that dealt with crashed systems and was referred to this forum. What has happened was that the system started crashing or freezing up, most of the time when trying to go online. I did have a virus at the time that was quarantined by McAffee and upon running Sea Tools for Windows software to check the hard drive sectors, the system had passed.
Upon a crash, I would have to cold boot. What I had noticed that brings me to a hardware question is that 50% of the time, upon cold booting, the fan would take off like a jet engine and I would have to shut down the system by holding the power button until the system shut down. The other 50% of the time, the system started fine and worked fine until it froze or crashed.
Now the thing is, it's not that the fan is accelerating because the system is overheating because it only accelerates intermittently and only when the system starts. When the system starts, the fan runs at normal speed and continues to.
Someone had mentioned to me that if the BIOS is not engaging properly or is corrupted that the fan might not be getting the proper signal. All this is beyond me and I don't have a clue.
I will say that the system wouldn't start and that prompted the Windows Start Fix tool which prompted the system to start. Afterwards I had installed the new Windows update and the system hasn't crashed since (I am writing this on another computer that works fine). When it was crashing significantly, I would come back to the computer in the morning (I leave it in sleep mode) and the system have to be restarted. that hasn't happened since the Start Fix Tool was used and the new Windows update was installed.
My concern, however, is what was causing the fan to accelerate upon startup only and only intermittantly. The thoughts I had were a Bios problem or a registry corruption that would only be fixed by reinstalling Windows but I simply don't know enough to assess this.