Most likely? Power supply failure. If your supply doesn't have automatic reset, it might be fried, or may have blown a fuse.
There are other reasons this could happen, but power supply failure is the most likely.
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It was my neighbor's computer that fizzled. No there is no burning or smoke.
Now I am thinking I am going to try and take out my power supply and put it in their computer to see if it will fix it. Is this safe? Will it burn up my power supply? Are the two power supplies likely compatible? Thanks in advance