01-16-2020 01:46 PM
I have a T460s. It is 3.5 years old and so out of warranty.
I always shutdown after a session, I do not let it sleep by closing the lid. I generally run it off the mains.
I used it at the weekend to do a Windows update and Lenovo update. This may have included bios, certainly one has been done recently but bios updates always reboot and then restart.
Any, after 3 or 4 days, I used the laptop again. And nothing. Press power, no lights, no flash, no fan. Just nothing.
Now possibly I did let it sleep (I am sure I didn't but ...) And during that few days the batteries drained. And then the charger broke. But that seems like a lot of unlikely events.
Perhaps the CMOS battery has drained but I thought they lasted years. And would a flat CMOS battery brick a machine?
I have taken the base cover off and everything thing is there with no obvious broken leads.
So can anyone tell me what would cause this? It can't be Windows because we are not even reaching bios, let alone an OS. I can't boot from a USB because ther just is no power.
Solved! Go to Solution.
01-16-2020 08:13 PM
Don't do this if you have an unknown supervisor (BIOS) password.
Do a complete reset by unplugging and removing the bottom cover and disconnecting the internal battery. Unplug the CMOS battery and press the power button a couple of times to drain capacitors. Put it back together; plug it in and let it start.
01-17-2020 07:36 AM
Thanks for this Rich. I wil try this.
Just to check - an admin password for the BIOS does not to have been set? On my previous thinkpad, I had admin and startup passwords set for the bios.
But for the T460s, I did not set the startup and am pretty sure I did not setan admin password for bios.
Also, how could the T460s have ended up bricked? I have seen dead PCs before but they always showed some sign of life before dying. I have never seen a laptop just do nothing?
01-17-2020 09:41 AM
No. You don't need an admin password. If you already had one and didn't know it, the reset would wipe the date and time out. You couldn't set them without getting to the BIOS.
"how could the T460s have ended up bricked?" I'm not sure, but I've seen it before. Perhaps, just before it ran out of power, it tried to hibernate and couldn't finish.
01-19-2020 02:43 AM
yes that worked!
Thank you so much and should you ever be in Reading UK then I owe you a drink!
I had to set the time in the bios on power up (month/day/year took a few minutes to realise) and windows PIN was no longer valid or working so I reset the pin and fingerprint but I have power and lights.
Once again, many thanks.