Black screen but booting up

[iZAkre]

Hello guys again,

Recently I replaced my battery for a used one. I replaced a 3 cell for a 4 cell battery as explained here .

Everything was going well. I full charged it, worked fine, and used it for a whole day without a problem. The last thing I did was let it drain the battery just iddling on windows until the thing occurred... My screen won't turn again. Hopefully I had installed TeamViewer with granted access in it and I could log in and check that the laptop is running, however, the screen is no longer recogniced by Windows and when trying to boot the laptop I don't even see the BIOS logo nor the boot screen.

It seems like the screen backlight is slightly shining but I can't tell for sure. I tried already some things:

1. Removing the battery and trying to turn it on without it.
2. Trying all different configurations of RAMs (RAM 1 alone in slot 1, RAM 2 alone in slot 1, RAM 1 in slot 2, ....), draining the power inbetween changes, without battery. Also tried booting without any stick.
3. Moreover, I left the computer running for an hour without the battery as a Youtube video suggested.

I did all of that yesterday evening, and left the laptop without battery for the whole night and tried again everything without luck. 

My guess is that the battery was corrupted and drained too much that affected the LCD screen or motherboard somehow. What shall I do? Any recommendations?

Best regards.

PS: I have a Pavilion 15 bc400-ns

[iZAkre]

New update!

I got video from a Ubuntu live usb boot! However I cannot get video from the bios / boot manager. I also did a bios recovery with an external usb but no video. The bios update was successful because i checked the logs. Could it be the internal gpu that is not working but Ubuntu is using the 1050M?d

Edit: In the Ubuntu live usb I did some tests (glmark2) on both gpus and they seem to be working just fine, so my hypothesis is discarded. Now I would say that the problem has to be with the bios somehow but I already installed the last version successfuly. I'm trying to install another BIOS version but the bios setup program provided in the download section is not opening so I don't know what to do.

[iZAkre · Accepted solution]

Just for the record. One or two days after publishing this I decided to just install Fedora and keep using my laptop without having access to bios and so on. After a long night copying files to my other compute, the next they after rebooting to Fedora's live usb I found that the problem was solved. I had again video from the BIOS as if nothing had happened.