I attempted a bios update on my T420s last week which was unsuccessful. I didn't think anything of it at the time, until later that evening after my computer had gone to sleep and I opened the lid to wake it up to do some work. Nothing. The light above the LCD (that white LED for working in the dark) blinks once, the fingerprint reader LED flashes once, I hear a click, and that's it. A few seconds later, it repeats this sequence.
I've tried a few suggestions I've found while scouring online for a solution... unplug the battery from the board for 24hrs, take out RAM and boot (which successfully causes a beeping alarm on boot due to lack of memory of course), etc. No change...
Any solutions out there besides replacing the motherboard?
Appreciate the help!