Hmm.. Have you tried plugging it into another socket? Use another power strip if you have to, as i think both power supplies can't be both faulty, right? I mean it's possible, but is this behavior is because some internal hardware failure causing this, and not the power supplies failing? Maybe.. Try the above, and also tell us what you've tried & experienced, any slowdown/ crashes while the system's on etc. unplugging everything.. inspecting/cleaning ports might help too..