Number one first thing you should do is unplug the power cable from the wall, and unplug it from the PSU BOTH. Do not unplug only one side. Then, push the power button on the case to discharge any residual energy. Now, plug power cable back in to wall and PSU and see if that will do the trick.
If that doesn't work, check the PSU switch - it's black, the back of the PSU (some don't have them).
Lastly, like Cynth said, unplug EVERYTHING in the computer and plug back in.
---------- Post added at 04:45 PM ---------- Previous post was at 04:44 PM ----------
Yes and try another power cable if you have one.
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Off the record, on the q.t., and very hush-hush.
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