Minecraft Launcher Nukes PC

[Forleb]

The problem is simple: I click on the native Minecraft launcher, and about 3-5 seconds later, the screen turns off & the PC pushes for another ~20 seconds before restarting. I am not even making it to the UI in the launcher - it just starts loading and bam, shutdown. The strange thing about this is that I was able to get fairly heavy Modrinth profiles to run with 0 issues on its respective launcher, so I can't imagine Java is the issue here. The last few attempts on the native launcher have been directly after the restarts, so it isn't caused by some phantom Modrinth library in the background either. Windows & drivers are up to date.

 

Any ideas?

[Forleb]

7 minutes ago, Caroline said:

Specs? if anything's overclocked return it to default values.

I have tuned the CPU and graphics card, but stability in general is not an issue. I've been doing full Cinebench and Heaven passes several times a week to confirm this. Again, this is just the launcher causing shutdowns, yet jumping straight into Cinebench from idle doesn't phase the system at all. Default CPU settings were allowing it to hit 107°C when I was first generating versions for Modrinth; It technically worked, but I obviously want to avoid frying my CPU.

[Alex Atkin UK]

54 minutes ago, Forleb said:

I have tuned the CPU and graphics card, but stability in general is not an issue. I've been doing full Cinebench and Heaven passes several times a week to confirm this.

This doesn't necessarily prove its stable.  The problem with stability is it can be one specific application that behaves in a way that triggers a problem.  It would be odd to be a launcher, but you never know.

 

I had an issue where when undervolting my AMD CPU it was perfectly stable in Cinebench, but after a Windows Update it started randomly crashing on boot.  I think it would hit a specific frequency in the voltage curve that somehow was unstable, but so long as it was under load it wouldn't happen.

[Forleb]

9 hours ago, Alex Atkin UK said:

This doesn't necessarily prove its stable.  The problem with stability is it can be one specific application that behaves in a way that triggers a problem.  It would be odd to be a launcher, but you never know.

 

I had an issue where when undervolting my AMD CPU it was perfectly stable in Cinebench, but after a Windows Update it started randomly crashing on boot.  I think it would hit a specific frequency in the voltage curve that somehow was unstable, but so long as it was under load it wouldn't happen.

So the launcher must be loading assets at a particular interval that makes it freak out when undervolted... hm. That's especially strange to me because my previous PC was tuned more aggressively & never had this happen, but it is what it is I guess. I'll try different profiles when I get home. Thanks!

[Forleb]

Update: Letting the CPU run fully default allows the launcher & Minecraft to run without any issues, though the threshold for undervolting is much lower than with anything else I throw at this system. Even dropping my CO from -20 to -10 still causes the full shutdowns from the launcher alone sometimes. With other limits in place, the default voltage curve is a solution that doesn't boil the CPU at the end of the day, so I guess I'm leaving it at that unless I get another shutdown.

[Forleb]

Update: It was the graphics card. I thought 21Gbps on the VRAM was stable, but eventually I had benchmarks crash & dropped it to 20Gbps. After that, not only is Minecraft playable, I have it working with the CPU at -20 CO. I don't know why VRAM would affect something purely CPU-bound, but I'll take this over 2% extra performance for sure.