If you can’t even get to BIOS, then it’s catastrophic hardware failure.
Memory, CPU, chipset.
Yeah, would seem a hardware failure. Just weird that they both had the same issue in a 24 hr span. I’ll have to download the Lenovo Hardware Maintenance Manuals for them so I can take them apart without breaking any plastic and remove modem, network card etc and keep narrowing things down. These things don’t even have consumer removable batteries so I don’t know if it’s safe to power them up without one or what it takes to remove them.