No, I didn't just change the pixel color.
The red screen is now part of the kernel panic function (which is now well tested - remind me to tell the story about the difference between step and next in the debugger, and how I spent an hour trying to figure out why call stopped working in 64 bit mode). If everything goes well, you get the aqua screen, else BOOM! red screen.
Under the covers, the code is now searching memory for the ACPI tables. Find them, you get aqua (actually alternating blue and green pixels, I write two pixels at a time 0x0000FF00_000000FF).
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