Your May 11 post says, "Ok, it stays on. But then when I turn it off to plug in the cpu power cable, it starts with the turning on and turning off ". I want to be sure I understand. First, the "CPU Power Cable" you speak of. Exactly what is that? Almost all mobos now have a connector on the mobo near the CPU socket that must have a cable from the PSU plugged into it to provide power to the CPU chip. It usually has 4 or 8 pins on the connector. Is this the cable you talk of? Are you telling us that, if this is NOT plugged in, your mobo will sort of turn on and the fans will keep running, but it does not really do anything, of course, because the CPU has no power?
The reply post right after that talks about where to plug in your CPU cooling fan. Is that the cable you are talking about - the Cooling Fan cable that plugs in somewhere? That is a whole different thing!
It is true that a mobo can be very touchy about whether or not there is a fan plugged into the CPU_FAN header, and whether or not that header can detect a good fan speed signal there. But you story so far suggests that header on your mobo might be faulty and that could cause some of your problems.
But then you tell us that removing a RAM stick improved the situation so you believe that RAM was faulty. Now, if I understand correctly, the mobo will work better, if not perfectly when that RAM stick is left out. Then you talk about it seeming to work without the "CPU Power Cable" plugged in, but failing when that IS plugged in. Now, IF the cable you speak of is the power supply to the CPU chip via the header beside the CPU socket, then the FAN has nothing to do with this!. If merely connecting power to the mobo CPU power supply header causes the system to fail apparently because the power to the mobo fails, then you have a very different problem. Either the CPU chip is faulty, or the mobo is faulty. Nothing you do with the CPU fan will solve that!
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