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  • Most Dell computers have a built-in diagnostic utility that can be accessed before the OS boots. If you can get into it run a full diagnostic.
    – I say Reinstate Monica
    Commented Jul 21, 2017 at 2:34
  • 1
    It doesn't seem likely that a malware would prevent the system from turning on, you might be facing a hardware issue. Start with taking out the RAM modules and try booting with just one of them, or a new/different one.
    – simlev
    Commented Jul 21, 2017 at 16:46