09-10-2016 08:55 AM
09-11-2016 08:25 AM
I have a W541 having the exact same issue. After updating BIOS to 2.28 yesterday, I am no longer able to boot to Windows 7, can't boot original factory Windows 7 image, can't restore using Windows 7 repair disk, can't install new Windows 7 or Winodws 10. Any attempt with Windows gets stuck trying to boot at CLASSPNP.SYS.
After 10 hours of troubleshooting, I am 100% sure that this is a BIOS issue as that was the only and last thing I did before this problem.
I would like to try the DEP settings, but I can't seem to find that option in my BIOS. Could someone please explain where I might find it? Thanks.
09-11-2016 08:50 AM
Kudos to everyone here. I was able to "fix" the problem following the previous link posted regarding DEP.
I was able to boot Windows by disabling "Execution Prevention" in Security -> Memory Protection.
09-12-2016 12:24 PM
I have been using this Thinkpad W540 with 32GB ram , swapped out the blu-ray player for an additional ssd for over 2 years now . Today a new Bios upgrade occured , after the restart and the successfull flash of the bios it proceeds onto the Windows boot screen as well and then hangs . I see similar issues when i try to boot into linux on the other hard disk the cursor just blinks on the top of the screen after the lilo boot prompt and selection . Any idea what can be wrong or can be done to save this ?
09-12-2016 12:54 PM
I've moved your post to the existing thread on the topic. Please try the work-around described up-thread:
TLDR: go to BIOS and turn off DEP: "Execution Prevention" in tab Security -> Memory Protection.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.
The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored - questions and answers belong in the forum so that others may contribute and benefit. ... GeezBlog
09-12-2016 08:39 PM
Thank you . Works like a charm for some reason i tried out every other BIOS setting last night before posting but missed this one . Money saved !!!!
09-13-2016 06:20 AM
In response to customer reports of ThinkPad notebook systems freezing after upgrading to a BIOS published in August or September 2016, Lenovo has investigated and found root cause.
More information can be found in this KB article: https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/ThinkPad-Notebooks-Freezing-At-Boot-Up-A...
A customer-reported workaround for restoring normal boot up behavior can be found here: https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T450-Windows-splash-freezes-after-BIOS-u...
I will post again when the engineering Service TIP is published in the next day or two.
09-14-2016 11:03 AM
In response to customer reports that after a BIOS update to some ThinkPads, the system may fail to boot, hanging on the Windows splash screen, Lenovo has provided a Service TIP detailing a workaround. A permanent solution will be provided via future BIOS update.
Please note that Think Engineering has been notified W541 is missing from the list, but is included for this issue since it shares a BIOS with W540.
The Service TIP can be found here: https://support.lenovo.com/us/en/solutions/sf16-t0079
09-16-2016 11:24 AM
A few hours ago I run also on this issue on updating the BIOS on my W541 2.28. I was searching a some hours for a solution and tried quite a lot and finaly i found this thread.
The described BIOS settings resolved my problem.
In order to help others, I'll add a problem describtion and solution in German language to this post:
Nach BIOS update friert Windows beim booten beim Splash-Screen ein. Ebenso der automatische Reparaturvorgang oder ein booten von Windows von einem Startmedium.
Lösung: Deaktivierung von "Execution Prevention" im BIOS wie oben beschrieben löst dieses Problem im "workarround"