I bought a INTEL 865G S.478 800FSB DDR MOTHERBOARD OEM to stick in a Dell 4600 case, as the motherboard went bad. I do some searching to find the manual and such only to find out its a Emachines board. Didn't like that fact, but thought oh well its a cheap board. Problem I'm having is that it powers on by its self without any atx power switch connected. I have tried a different power supplys and same results. If I shut the system down by using windows shutdown then it wont start unless I unplug the power supply and wait a minute. It briefly starts and stops, about 5 seconds later it powers up completely . There are no cards installed in the system yet. I went into the bios and made sure everything was set correctly. Thinking its a bad Motherboard. I have never seen a board power itself on with out the atx power switches hooked up to the motherboard. So it can't be a case switch, as they are not hooked up. Any help would be great.