When the laptop is plugged in, it displays "Plugged in, Charging" however, the battery goes down, down, down. The charging LED comes on at the front of the laptop, as well as the light on the DC jack itself. When you take the battery out, the laptop immediately shuts off. The LED charging light ALSO goes off. With the laptop powered off, and the battery replaced, the LED charging light will come back on.
Here's what I know: It's not the battery. I charge the battery for this laptop in my HP G60-235DX. I can also use the battery from the G60 in the dv4, and it still does not charge. Also, the battery in the G60 is only a few months old.
Here's something curious: The charger for the dv4 does not charge the dv4, but it does display "Plugged in, charging" and lights the charging LEDs. The charger for the G60 has absolutely no effect on the dv4. The charger for the dv4 works with the G60, however. Both chargers are the same. They're replaced by the same HP replacement part, all the same specs and everything.
Here's something futile: I already tried to replace the DC-in jack. It did not change anything.
I've tried the BIOS update. I've tried the whole uninstalling the battery thing in the Device Manager. I've tried all combinations of turning off and on. I've tried removing the battery while the laptop was plugged in, only to have it shut off.
I'm really crossing my fingers this is something better than a motherboard issue needing repair...in classic technological fashion, my warranty expired TWO WEEKS before this.