OK, lets start with what's the version of Windows on the computer (most likely W10 if it's only 2 years old)?
Have you tried the F2 option? That should let you run diagnostics on the system
When you tried F12, you said you couldn't make any sense of it. Was this because the screen was scrambled, or that you didn't know what the options were for?
It's not unusual to not know what the options are for in W8/10.
Do you have recovery media to reinstall the OS? Either from Dell or from Microsoft.
Do you have your data backed up (if you do a clean install it'll wipe out all the data on the system?
What happens if you:
- turn the system on
- let the little circle of dots spin once or twice
- hold down the power button until it shuts off.
- do this 3 times and the system should state that it's checking your system - and then boot to a screen with a bunch of squares and some text.
Does that work for you?
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