By going back in time to a version that you know worked.
If that doesn't fix it, then you can be sure the problem is hardware related, because it still happens on the exact same software that used to work.
And if it does work on older software, then you can go forward one update/snapshot at a time, until you find the change that causes the problem.
What you need to do is compare different points in TIME (older versions), not the same software just installed differently.