@sparks203, First make sure the charger is working (use a DMM, digital multimeter) and outputting the correct voltage.
The first suspect in cases like this, is always the battery. A bad p / dead battery is the primary cause of no charge and no power. Try opening the Dirt Devil up, to gain access to the battery, and then test the voltage of the battery.
You didn’t specify your model, but here is a link to [link|https://www.manualslib.com/manual/1155105/Dirt-Devil-Gator-M138.html?page=25#manual|p25 of the operating manual] of a Dirt Devil. It shows which screws to remove to get access to the battery.