Hello everyone, my T480 suddenly won't boot. When I press the power button, it plays a melodic error code (I believe it's error 0001) for a few seconds and Power button stays on. This happened after I missed a BIOS update from Vantage and left the laptop unused for a couple of days.

I've already tried replacing the CMOS battery and reseating the motherboard connections. On one single occasion, I managed to get into the BIOS menu but didn't know what to do, and after a restart, it never came back (before this, no melody was playing just boot for a second and then shuts off).

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