There are thousands of reasons why a computer can fail to boot. Unless
you're able to provide enough additional details to narrow down the
possibilities, you'll need to try generic troubleshooting or show the
machine to a professional.

Can you boot into Safe Mode?
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Leonard Grey
Errare humanum est

alsarg wrote:
My older computer will not boot. It gets to the Gateway logo, with all the
dots on the top of the screen, stops and re-starts over and over again.