i've just upgraded my system and trying to put together the following bits Asus P5WD2 Premium 955x Chipset Pentium D 930 (3.0Ghz dual 2mb cache etc) XFX Geforce 7800GT "Extreme Edition" Corsair XMS2 DDR2 6400 I plug it all together, with the P8 8 pin connecter for dual core, the 24Pin mainboard power cable for PCI-E, CPU and Northbridge are watercooled. Plug in my 7800GT as normal into Main PCI-E 16x slot plug hard drives in (3x SATA) My Audigy 2 into PCI and all the other needed motheroard connectors and extentions etc. and power up. (Oh and plugged it the power to the graphics card) The first time i did this i was using a tagan 480W, it didn't post, i couldn't even hear my hard drives power up, (didn't think of lack of power to begin with). so took out ram to see if i got any beeps.. no beeps Took out GPU to see if i got any notion of life from it, and my hard drives powered up, but thenmy motherboard began to smoke (a little relay underneeth th DIMM slots). so that motherboard went back, and they sent out a replacement. Thinking it was a lack of power i decided to get hold of the Seasonic S12 600W. to be sure that wasn't the problem. set it all up again, and hay presto no posting, hard drives weered this time though. Reading the manual i noticed that some cards didn't like the main 16x PCI slot onboard, so i thought i'd try putting the card into the secondary 4x PCI slot as from what i had read every card listed in the manual had passed in that. and guess what! The board started to smoke again, same relay undereath the DIMMS. I have testing the card in a mates computer and that works no problem. but i don't have any way of testing any of the other parts. Is this a compatibility problem or is it something else that i seem to be missing. Coud someone shed some light on this for me, any idea's to what the problem may be. Thanks, any help would be very much appreciated.