Having got previous problwm sorted I got distracted and made a big mistake. I pushed a card in whilst some power was still on and now I get M/B light but no POST and the fans turn but stop almost immediately. Have I finished my M/B or maybe worse as well?
Remove everything except cpu graphics card(if needed) and one stick of memory and attempt to boot, if you don't get fans running and error message about hard drive missing the CPU PSU or board is fried. Substitution is then the only way to pin it down further.