ok, your going to need to post what your set up is, mobo, psu, processor the lot before anyone can even start to try and help
Ill check back inna bit
Ok... I have a i7 930 CPU, an Asus P6X58D Mobo, 2x 480 SLI video cards. 14 fans, OCZZ1000M PSU, Kingston DDR3 12gb
One thing I noticed.... It is normal for the PSU to keep the PSU fan running after shutting the machine down. The PSU fan runs even after it keeps the machine on after 2 seconds.
I started by removing the molex connections to all fans and one 12v connection to one of my SLIs.... Still having the same issue though.
I should note that I left my machine on and it went into standby. After I powered it on, the screen wouldnt come on but the machine was running. I had to force power it off by holding down the button. After doing this, that is when the problems started.