RE: Laptop (dell inspiron 15-7000 series-7537) wont start
It could have simply been a program or utility hanging the system. Holding down the power button for a couple minutes should have fully shut down the system allowing you to boot, but baring that, you either have to remove the battery or wait until it is fully discharged.
I do suggest running diagnostics just to make sure that this isn't and indicator of possible hardware failure.
Please check here for more information on how to run diagnostics. Please let me know what you find out.
Specialize in Laptops, Mobile Devices