I have an Inspiron 15 7579 2 in 1 only 3 months out of warranty. Noticed a few sluggish power ons ( not boot up just basic power) but was working fine. Plugged it into ac adapter at night to charge and next morning it was completely dead. No response to power button what so ever. I tried the 30 second depress the power button to discharge. Removed battery tried again. Checked the ac cord which had the correct volts. No geek squad near me. Is there anybody that can give me a clue?