I bought a second Antec Neo PSU last weekend. I installed Windows but didn't do much else. I only used the pc again this morning, and all was fine. I turned it off and came back in a few minutes and tried to turn it on again. The little led on the mobo that's always on wasn't on either. I plugged in a different PSU and it worked. I then went out very frustrated and when I came back a while later it worked fine! And now it won't start again. wtf?