First off I have: Intel Core 2 Duo 2.33 GHZ XFX nForce 680i LT SLI Motherboard nVidia GeForce SLI 256 MB Graphics Card (only 1) 2 gb crucial (whatever company) ram and blah blah HDD's but I have a 500w power supply and only thing with that is the 4 PIN power connector in which I have an 8 PIN connector on the motherboard. I been having it for about a month and when I first turn the machine on, the CPU fan speeds up to ultra fast and loud for atleast 3 to 5 seconds until it finally slows down to a normal speed and the computer starts doing its thing from bios on down.... Well I have been noticing lately for the past week that when turning it on sometimes, the fan will stay up to that insane speed and the computer wont do anything, it wont even start the BIOS or nothing for the machine. I end up doing something random like removing an external hdd firewire cable or taking out a usb and trying again and it ends up booting up fine. Well this morning I came home from work only to try and boot the machine with the constant high speed fan going loud and nothing again. I tried everything i can. I went as far as taking out every PCI, HDD and CDROM even extra whatever the hell like the firewire eSATA and USB for the tower. Nothing is working to get this machine booting up and its critical to me not only because I was trying to make some extra money for the holidays but period this is my studio working machine where I edit music videos and produce tracks for people music and radio wise. I'm coming here first because it seems the best place to ask a question like this and hope for some help to diagnostics here. I don't know what it is but im pretty well with computers, im guessing its either the CPU, RAM or the fact that my power supply has a 4 PIN mobo power and the motherboard calls for 8 PIN. Now the manual even says if you only have 4 pin then stick it in there but what do i know about that... lol Anyone with incite? Thanks in advance!