tmlhalo

Have you ruled out issues with the charger and not the laptop?

If you interrupt windows loading 2 or 3 times (hold down power button) you should be brought to a recovery environment. Do a system restore to a point before you messed with windows boot configuration. Sometimes there is an option called "last successful configuration"

I skimmed through the online manual and it doesn't seem to be there. Technically we can overvolt the CPU a bit or underclock it by like 200MHZ and it should provided the same experimental data if this is a power instability issue. I would go with the underclock by 200 MHz so you don't have to then double check temps.

Make yourself owner of the file. Right click on file, properties, security, advanced, click change on owner at the top, type in your login name and hit check. Make sure you don't have typos if it doesn't find your username. Check the box that says "replace all child.." do apply and ok and let it finish.

Lower ram speed (MHz) in bios. Send a bit more power during spikes by setting load line calibration to like 3 or 4 in bios. Try after that.

If it is power related you can probably provoke it with a benchmark like prime95 or furmark. Then check event viewer for more information.

Check event viewer for GPU driver related crashes. Otherwise it could be an unstable overclock. A lot of boards have a multicore enhancement or precision boost that does a bit of auto overclocking. Since the crash seems to happen in demanding applications you might be able to increase load line calibration in the BIOS and it will buff out the issue.

It is a portable program. Display Driver Uninstaller from Guru3D. It will completely remove all the displayer related drivers for a selected vendor. You'll need to run it twice for intel and Nvidia and then restart. Then you'll want to download the lastest drivers from both. Once the GPU drivers are communicating correctly they should switch based on 3D application without you needing to do anything.

Can you nuke both your intel gpu driver and nvidia driver with DDU. I would also do Windows Update and see if there are any optional driver updates pending once you try that.

I wonder if it is using the Intel graphics because that GPU doesn't have dedicated VRAM thus it is using system RAM. Right click on the start button and select device manager. Under video adapters try disabling the Intel GPU.

It is a power saving feature within Windows. When no 3D application is being ran it will switch to the Intel GPU. Once you start up a 3D application the process will kick over to the Nvidia GPU. If you have a ton of mods then you could be using up more RAM than what Java is normally allocated. If 32bit Java is installed then there is a limit for how much memory can be addressed so it will cap out at 3.4GBs. If you have 64bit Java installed then you can assign more than 3.4GBs. Once you use enough RAM your computer will spill over into virtual memory. You can double check that you virtual memory is at least 1:1 with the amount of RAM you have. That tends to solve some sleep related issues. (Not the issue here). Once you dip into virtual memory the performance will tank. You can consider nuking some of the graphical settings to keep the game with a more reasonable memory envelope if you see the virtual memory usage going up a lot within task manager.

OK, so from your other post it is working. Both computers are good now?

Could you try one screen connected only to the GPU / laptop screen only.

Are you running multiple monitors?

Try a USB with Ubuntu to see if it is a Windows 10 issue with such old hardware. If that works then work your way down Windows version until you get a hit.