Boot Failures: Occasionally, the system fails to boot. The power button light blinks slowly, and the screen remains blank. The only way to recover is by holding the power button until the system fully shuts down, then restarting.
Sleep/Wake Issues:
If the laptop sleeps with the lid closed, it hangs on wake.
If the laptop sleeps with the lid open, it wakes properly.
Troubleshooting Steps Taken
Restarted the system.
Updated all packages and firmware, including the BIOS.
Downgraded the kernel to test for regressions.
Images showing the graphical artifacts (apologies for the dirty screen):
A memory stress test seems worth doing, try memtest86+ (also available as a Fedora package). If it does find problems, try swapping SODIMMs between sockets and/or just one SODIMM installed.