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Hello and welcome to JustAnswer, I look forward to assisting you today. Feel free to disregard the Premium Service Offer for Remote Support. That is an automated popup initiated by the web site. Is the motherboard the same make and model that was originally installed?
Would it be possible to send me a picture of the message that is on the screen?
That may be all you need to do?
A cold restart.
Any hard drive activity?
Make sure the monitor didn't turn off.
Did you possibly check with Dell to see if the warranty covered the board?
Try this first. Pull the plug the press and hold the power button for about 30 seconds then see if it will power back up. You're not wasting my time.
Does it boot up at all?