We have the technical direction which you may not find useful as I note that we use our VOLT METER (got that?) and then we move to the old CHANGE A PART AND TEST method.
Frankly at the age and story I would be shopping for a replacement laptop. Even a refurb will cost less than any shop or service center.
I have a Dell Latitude D520 and the power abruptly turned off a few days ago and won't come back on. The battery has been dead for a few months so I've been running it on AC power and that's worked just fine for a while but about 4 days ago it died. I unplugged everything, removed the battery, and put it back in/replugged in everything and it still didn't work.
When I plug the charger into the wall the green light comes on but when I plug the other end into the computer the light goes off. I've tried this with two chargers now. Is the problem with the charger, the battery, the power supply...? Please help. Thanks.