What happens if you keep tapping F12 when you turn it on? Anything on the screen?
If so, you may be able to try the Dell diagnostics from there.
IMO this sounds like a hardware failure - most likely the hard drive. But this is just a SWAG (Scientific Wild A**ed Guess).
Try disconnecting the hard drive (after removing the power cord and grounding yourself on the case).
Disconnect both cables to the hard drive and see what happens when you boot. If you can see the Dell logo, then it was likely the hard drive causing the problem.
If that doesn't work,then try removing the RAM (again, removing the power cord and grounding yourself on the case).
Try one stick in the first slot (you choose which is the first slot). Then try the rest of the sticks, individually, in the first slot (remember the power/ground thing).
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