Hi my other computer hp pc m1180n just went black no power. So I purchased new power supply and power cord . when connected screen looaded but periferals were not loading for keyborad or mouse both wired and wirelessly. I checked wired hardware on differant computer and they are working. So possibly was power cord not correctly hooked up and is there a diagram of internal hook up? is it possible that power arked to mother board and what is a good test of that?