Open your tower up and and make sure everything is seated securely in its slot (Memory, CPU heatsink, power cables). If that doesn't work somewhere on your computer, I think dell has its on the back where you plug everything in, should be 4 lights, see what color each is, if its not on the back it will be on your mother board. I highly doubt its your hard drives because you would at least get to the BIOS, so its either a power supply, CPU, or memory issue.
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