05-27-2011 03:40 AM
On at least three separate occassions my T420s has randomly powered off -- no warning, no memory dump, no blue screen. It just freezes for a few seconds (the screens are on but mouse doesn't move) and then just turns off. I think all of them happened while the T420s was docked, but I can't be sure. This is very weird.
OS is Windows 7 64 bit, factory build.
05-27-2011 05:41 AM
I have not upgraded the RAM.
There was something in the Event Viewer. Looks like I had 4 Critical events at different dates that seem to correspond to when the shut down happened. Here are the events:
Event ID: 41
Task Category: (63)
"The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."
06-06-2011 04:31 AM
Hi All -
This happened again -- during the night it had a random shutdown. When I went to use the laptop in the morning, it was off and I had to start it up. Once again there was an event logged in the event viewer.
Is this a hardware issue with the T420s?
08-22-2011 09:20 AM
Anyone happen to know if there is a fix for this, or what is the root cause? My company recently began deploying the t420s, and our first (only) user thus far is having issues with random shutdowns and/or not being able to shutdown. I went through and updated drivers and the BIOS which seemed to make it better, but it just happened again this morning.
09-15-2011 07:16 PM
Hi, I've got the exact same issue. New T420s, Windows 7 64 bit. Randomly powers off, after freezing for a few seconds. This happens roughly once per day, but sometimes it is more frequent. I too thought it might be the dock, so I tried running the laptop without the dock. Worked ok for 1 day but on the second day it happened again. So I'm fairly confident it is a problem with the laptop itself.
Machine type: 4173 K8M, dock type 4337.
Anyone have any ideas about this?
09-16-2011 06:37 AM
Our 1 deployed unit (so far) has at this point been swapped for a different machine (same model, t420s) to see what that does, so far so good.
If the problem stays gone for a few weeks, I'll likely contact Lenovo for some warranty service, as it seems like some bad hardware.
10-20-2011 02:47 PM
I have just bought a T420s (4173-R36) and I have the same problem. Random freezes and sometimes ahutdown after.
I have installed Windows 7, 64-bit and all the drivers for T420s from the lenovo drivers site for this model.
The problem also appears when you work on the laptop (like editing some images).
I have perfored full tests with:
- memtest86 (RAM)
- SeaTools (SSD)
They show no errors. So I assume it is not a problem with the hardware. Probably it's one of the drivers.
Any knews on this from somebody having this problem? Or are you other out there that have the same problem?
10-20-2011 03:05 PM
We ended up swapping the HD for the busted machine with a different t420s, and of course the problems went away.
I called Lenovo and had them send out a tech to do a mobo swap on the problem machine. I figure if you aren't going to support on your forums, you can send someone out under warranty.