01-14-2017 07:20 AM - edited 01-14-2017 11:44 AM
I have a ThinkPad T420 with this characteristics:
CPU: Core i5 2520m
RAM: 16 GB Crucial
Graphics: Intel HD and NVIDIA NVS 4200
1. SAMSUNG SSD EVO 850 (as OS disk in a bracket inserted instead of DVD ROM)
2. WD HDD 320GB 7200 rpm
I have worked for several mounts with this system perfectly and there was no problem. Newly, a bad problem has been appeared: when I put the system to sleep for a long time, the system won't wake up (the power LED flashing, Bluetooth LED and CPU fan being on). After force shutdown, in the boot process BSD error occurs and after several restart, finally Windows will boot.
The BSD occurs when I turn on the laptop after a prolonged shutdown or hibernate also. I emphasize that the problem occurs when sleep conditions (or being turned off or hibernated) is for a long time (more than an hour) and in short time periods, there is no error!!!! The computer restart command works properly (shutting down via the Windows and booting again).
I tried several solutions from internet search as followed without permanent success!
1. Check disk (with /f and /r flags)
2. sfc /scannow
3. Power management modifications (disabling hybrid sleep, disabling HDD turn off, disabling hibernation, disabling wake up timer)
4. Fresh installing Windows (Windows 7 and 10) several times
5. Updating bios to the latest version
6. Updating windows to the latest released updates
7. Updating drivers to the latest versions
8. Disabling intel SpeedStep technology from within bios settings (it worked for some days, but the problem came back!)
9. Disabling NVIDIA from bios and working with intel graphics only and vice versa.
10. Fully cleaning SSD with clean command from "diskpart" and with SAMSUNG secure erase tool in SAMSUN magician.
11. Removing the HDD from laptop.
12. Changing the SSD port (in DVD ROM port and in default HDD port)
13. Reputing RAMs and exchanging their slot positions.
14. Full hardware checks not showing any problem in the hardware (memory, HDD, SSD, Motherboard and …)
15. Removing battery and AC power separately.
16. Testing three conditions in the virtual memory settings: automatic page file, customized page file and no page file.
The other things maybe important to noticed is that the problem began from after a fully battery discharge when the laptop was in sleep mode. The BSDs are different but the most frequent one is "Kernel security check failed". Sometimes it is "memory management" with no logged information in dump files (logging is enable in the windows setting).
A major question: basically, what is the difference between prolonged sleep (or shutdown) and short time ones?!
Please help me to resolve this problem.