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Dell will probably have you do a system recovery - if you don't mind starting from scratch and losing what you have installed, I'd recommend you try that if you think it's a software issue.
Press Ctrl+F11 on startup to access Symantec System Recovery. It will restore the computer to the exact condition it was in when you took it out of the box.
If this won't run, you probably have a hardware failure, you can access Dell diagnostics by pressing F12. You can try this before doing the recovery if you want, Dell will probably have you do that anyway. Unplug all peripherals except the keyboard and mouse.
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