Oh boy is this a strange one. I bought a coolermaster HAC-V81 Fan today for my XP2200, which sits on an Abit AT7 Max2 board. The fan comes with power plugs that go inline with one of the hdd power cables & has the old 1 lead sensor wire to put into the mobo fan slot. When I start the machine it starts & immediately shuts itself off. Even holding in the power button it "heaves" like a bad clutched car....I put back in the original AMD fan & it runs like a charm. Any clues here?? Does Abit have something hidden in these things that if it doesnt sense a fan it shuts down..... Im about as lost as I can be....Ive looked thru the bios but cant seem to find anything that would cause this. Thanks for any & all help!

Actually, yes many motherboards will shut down if there is nothing connected to the fan header on the mobo.

Yes but htis had the sensor wire that came with it connected...