I have got this motherboard : Intel Desktop Board D860PERL,,,,,,I just tried to change the case for it, now it does not work. I unplug all the cables (CD and HD ,,the FAN does not spin (some time just start to spin and then stops) . I removed the cmos battery does not fix the issue. I tried another power supply same thing still going on. I have got another motherboard it behaved same thing with both power supplies? I do not know if I did something wrong with cablings ? For the CPU fan to work (testing) do we need to connect the cables to a front panel jumper,,,,,I do not thing so,,,,,but I did connect them
Take everything out except the processor. I mean even RAM, graphics card etc. Just to see if it starts up.
You might check that both the 2x2 pin power plug and the 24 pin main power plug are in their connectors all the way.