My daughters laptop just suddenly quit working & will not come back on. we've tried a new battery .... no luck we've tried without battery....no luck we've tried different ac adapter...no luck mines doing that too. I was on the internet and it just stopped working. Everything just shut off. It came back on the next day, and it said the battery was charging, but then it completely died and now the battery wont even charge. Its bullcrap!
A common trouble is that the solder joints from the power jack to the motherboard can break. This is due to flexing the power plug over time. When this happens the power can't get onto the board at all to run the computer or charge the battery. Sometimes the connections may still work, so you get the intermittent operation you mentioned.
Usually this can be repaired, but it means disassembling the computer to take out the motherboard and resoldering the connections. In some cases, the motherboard can be damaged by heating and arcing from the bad connections and can't be repeaired, but this is pretty rare. A computer shop might be able to do the repair if they get into that level of service.
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