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Have you had a read of this?
https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen
Maybe try plugging in an external monitor when the issue occurs, to see if that works. It's useful to find out if it's a software issue like X11 crashing, a GPU driver issue, or a hardware fault.
exteroceptive
After my posts a month or so ago about struggling to get a windows install for my blanked laptop, I went ahead and installed Ubuntu on it instead but now I'm having an issue with the screen randomly going black. Can be 30 seconds after booting or 30 minutes. All I'm doing is Firefox browsing but it isn't consistent with doing anything else in particular. Computer stays on but screen dies and there's no way to get it back on but force shut down and restart.
I've switched off all power saving and screen sleeping options but still persists.
Any ideas?
Alternatively would someone post me a windows 11 boot usb? I can pay the post and return the usb after.