Hold the power button down for at least 8 seconds (it is 4 seconds, really,
but most people don't count seconds well!)
Then press it again and see whether it starts.
If not, you need to email Dell support.
Dell has email customer support, which I believe can be reached via this
link:
http://www.dell.com/us/en/pub/misc/segmenter_ccare.htm
although I had some trouble!
I also searched for a TDDY number for Dell, but didn't come up with one in
the time available--sorry!
