On Thu, 26 Sep 2024, Pavel Machek wrote: > > > When I press power button, it starts producing some noise (hdd > > > spinning up), but power light goes pulsating, not on, and I stare at > > > black screen. > > > > No beep? > > No beep. And no beep when I tried booting with RAM removed. According to: <https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x220_x220i_x220tablet_x220itablet_ug_en.pdf> pulsating power-on LED indicates the sleep mode: "The power switch stays lit whenever the computer is on, blinks when the computer is in sleep (standby) mode, and is off when the computer is off." I guess the system has become confused somehow. In the old days pressing and holding <Insert> while powering a PC up would clear any leftover NVRAM (ESCD BIOS) state (I earned a dinner once this way). I guess this trick no longer works nowadays? I presume you've studied the linked document for any hints? NB I do believe disconnecting all the power sources is enough for the EC to get completely reset. It's also what said document suggests to try if you can't bring a system out of sleep (standby). Maciej
