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Well, you’ve probably forgot to pay your electric bill… Just kidding!
It sounds like you’ve experienced hypoxia and blackout. See if you have the “Simulate blackout…” option checked in X-Plane General Settings.
In the Laminar default B738, the cabin pressurization is only partially implemented. Thus, if you have just left things alone from a “Start with engines running” launch, the cabin would have remained pressurized. But verify the two switches located at the bottom of the L Pack and R Pack in the overhead Bleed Air controls section—they all should be ON.
At 2,500MSL, the “blackout” could not be from lack of pressurization. You can uncheck the “Simulate blackout…” option in General Settings to confirm whether this occurrence is indeed hypoxia/blackout.
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