Dell reboots without warning

I have a Dell Inspiron 530 about 18 months old. It used to blue screen occasionally but that went away. Recently it has started re-booting without warning. Any ideas?
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More about dell reboots warning
  1. Most likely power supply but I would also test the memory with Memtest86 too.
  2. My friend had a similar re-booting issue and it was traced to a faulty 6-outlet power strip.

    Try plugging in the computer directly into an electrical outlet and see whether the problem goes away.
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