My Dell Vostro 2520 (modell no 2520-4568) does not turn on. If i press the on button the battery led flashes one white and three times Amber. If I change the battery nothing happens, not even led flashing. I tried to drain the residual power (by holding the on button without any power source) but nothing. I also tried another power brick. No luck.
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By power brick do you mean the adapter? Has the main battery ever been replaced on this 7 yr old model? Sounds like it has failed. Try removing the battery and use the adapter alone. If that works use it like that since buying a replacement battery would not be cost effective and might not even be available since it is so old. It shows as Out of Stock online. Save the money to buy a new laptop.