Why can't you restart PCs immediatly after cutting off power while the PC's running?

Why can't you restart PCs immediatly after cutting off power while the PC's running? I noticed that after cutting off power supply while the PC is running, some PCs can't be restarted for a minute or so. Why's that?
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Guest [Entry]

"Certain PSU's have a safety switch built in. This stops the PSU from being damaged when there is a sudden power failure, or a continues power dip that causes the power supply to switch on and off rapidly, which generally destroys the PSU.

I lost 2 older one's like this. Thankfully the newer one's will delay restarting long enough for the PSU to not ""pop"". This switch is only activated in the case of a sudden power failure. There is an actual patent for this you can read about here."