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Laptop power on "intermittent" isssues even after replacing the battery

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hi
A month ago, my laptop (HP Envy 15-as002la) which has been in use for over 6 yrs, decided not to turn on. As part of the initial troubleshooting, I disconnected the battery and try to power it on only with the AC adapter. I was able to turn it on ONCE, I backed up my files, and decided to buy a new battery just thinking it was a battery issue. After replcing it, laptop started working "normally again" without major issues.... power on, power off, hibernate.. all was good!

But after 4 weeks of "normal use", thinking that the new battery had solved the problem, the same problem came back. I used the laptop one night, left it with maybe 10% battery and forgot to plug it to the AC overnight. Probably it was drained and the next morning it didn't power on.

Once again, I did the same troubleshooting as I did the first time (disconnected the battery + plug it to AC) and it BOOTED UP after a few times pressing the power button (luckily). Laptop was running only on AC while backing up files. I closed it, and when I tried to open it again to see what could be happening, it doesnt power on :( I would like to know if this could be a sign of problems with the AC input (adapter is working fine with other laptops), RAM issue, HD issue, MOTHERBOARD or any other issue... :(...

Some the things I've tried so far are:
1) First try: laptop on AC, battery disconnected, power button lights on, laptop SEEMS to start, but it doesn't start.... screen is black, some hardward components seem to be starting, but No messages on screen

2) Second try: I unplugged it from the AC, pressed power button for 30 sec to drain it, plug it back to AC, battery still disconnected, press power button and IT DOESNT POWER ON.

3) third try: unplugged it from AC, drained it pressing power button for 30 sec again, plug it back to AC (this time NO light on the AC input), NOTHING HAPPENS (Totally dead).

4) 4th try: connected the battery again, plug it to AC (light goes ON on the AC Input), no light on the power button, NOTHING HAPPENS (totally dead)

5) 5th try: battery disconnected again, press power button for 30 sec to drain it, left it 20 mins without AC and WITHOUT BATTERY, plug it to AC and the LAPTOP TURNS ON AGAIN!!! (fully operational)


WTF could be happening? why is this so interminent?

Any advice is appreciated.
 

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g'day Sergio and welcome to the forums. :)
sorry for the delay.

what is the history of the new battery - as in, where did you get if from and what is it's manufacturing date?

and what is the latest - still working with the battery left out of the loop and the laptop only running on mains power?
 
Usually when the main battery fails, the CMOS battery fails as well.

The result is -especially for the HP systems- power on delays -sometimes 1.5-2 minutes- and then the message CMOS error press enter to reboot appears.

Wait a few minutes before you restart thesystem, and make sure the AC Adapter is functional as well.
 
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