Acer laptop no power signs

I have a 3-4 year old acer aspire 5742g laptop.

The past month it has been misbehaving a bit.When I plugged in the power it would take about 5 mins to show any power signs (battery charging light) and while it didn't show power signs the power button doesn't work either.But now it doesn't seem to work at all.

I am looking for anything helpful as to why it does that weird behaviour

I have measuredvthe power output, the label says 19V and it gives 19,5V.

Also tried powering on with ac only and battery only none worked.

I have tried doing a power drain as some sites say but it didn't work

Its power control died. Not the battery, but the highvoltage electronics regulating the power distribution between the hw, the power supply and the battery. There is no simple repair for your problem. In your place I tried to buy somehow another bad laptop of the same type, but with another problem, and then "unify" them to a single, working one.

There is a little chance, that your laptop will work, if you entirely remove the battery and try to use from the power cord only. In this case your battery is extrem faulty (makes a short circuit).