With Cypress, you can easily create tests for your modern web applications, debug them visually, and automatically run them in your continuous integration builds.

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You are using the run all spec command right.
If the screen blanks out then it runs out of memory. You should set the numTestsKeptInMemory to a lower value. Default value is 50 tests but if you have 5 scenarios with 170 steps it keeps all that in memory.

So I think best value would be have 2 specs in memory or not use the run all.

If you need to run all specs just use cypress run command instead