I stupidly type this entire thing out earlier then hit preview instead of submit . I've been planning my new cooling system for quite a while now and the parts are slowly starting to arrive, now so its time to turn my attention to the control system i want to control startup,shutdown and emergency shutdown of all the things connected to my comp. I'll briefly outline the parts involved and the problems i'm having. Crystalfontz 633 LCD Pelt PSU - 12-15v variable output 40A PSU to power one 220 and one 80 watt pelt Eheim 1260 Pump Fans - 3 Delta 120s and 4 80mm papst Flow Circuit And the circuits which im now trying to figure out. Now the question is how to get it all to work together, im no master with relays, and switching the AC line on the pelt PSU with a relay isnt an option as im not paying for a 40a rated relay. I keep thinking that two 555 timers and two latching relays would probably do it but im not master like i say. Cant figure out how to get the mobo power header line to do all the things i need So i need to: A> press power lcd for start pulse,Start The pump and fans with relay1,3minutes,then the pelt psu,10seconds,then the comp power-on pulse B>Shutdown, shut everything down on comp shutdown Now that could be WAYYYY off the mark, and i know that doesnt take into account the pulse nature of the power header at all, but after reading a half dozen different 'relay for pump' guides im still fumbling in the dark. I had considered trying to fit this flow switch in aswell, but i'm not entirely sure how to . Hopefully someone with laugh at my idiocy for a few minutes then be able to steer me the right way, i dont expect anyone to rough out a diagram or anything like that, not for something this complex anyway, but i could really do with some help. Now all i have to do is hope Macro or one of the other bit gods has some spare time to read through all this .