

Hadn’t heard about those, but a quick search shows those aren’t standard barrel connectors, although they look similar. The Dell connectors have a third pin for data. Normal barrel connectors only have two pins.
For the OP, that means that if your laptop is a Dell from the period where they were doing this, you need a specialized cable and charger intended specifically for Dells.
Now you got me curious, so I got up and checked:
2008 HP laptop: Appears to be a standard barrel with no center pin. (Also has yellow trim and is in-line with the cord.)
Circa 2013 HP laptop: Has the connector with the center pin. (Larger than the barrel on the 2008 model, and at right angles to the cord)
So it’s era-dependent (and I used that 2008 model too long). TIL.