Windows: Tracking down the dreaded 'Nvlddmkm" or 'Kernel-Power (41)' error

Here'e some tips on how to get to the bottom of this nuisance and save some $$

Have you been getting the the dreaded 'Nvlddmkm(Display driver stopped responding and has recovered)' NVIDIA display or 'Kernel-Power(41)' errors? Has your system been auto rebooting out of the blue? Getting the BSOD? If you are having trouble with tracking down either the 'Nvlddmkm' NVIDIA display or any other display driver error perhaps along with the "Kernel-Power(41)" error, follow these tips to help you track down the fault.

The 'Kernel-Power (41)' error seems pretty simple - your power supply has an issue, but this error coupled with the 'Nvlddmkm' error in particular is very vague and seems to happen when there was a power outage or electrical malfunction. It can also come up if you recently made a hardware upgrade or BIOS change. Before you go out and purchase a new PC, try to isolate where the fault lies with these tips.

  1. Start by Changing the performance settings
  2. You can also attempt to change the performance settings under 'Power Options within windows Control Panel. You want to select the lowest performance settings, make sure the 'Link State Power Management' option is set to 'OFF' under the PCI Express sections. Also change your Theme to 'Windows Classic' and test.
  3. OK need more input Johnny 5? Change the Reset Timing
  4. NOTE: This can have unfortunate results, because you have to edit the registry, which can mess up your computer if done wrong, you should make a backup before you try this!
    1. Goto registry editor (start -> run -> regedit)
    2. Navigate yourself to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers (make sure GraphicsDrivers is highlighted).
    3. Right click -> New -> DWORD (32-bit) value -> Name it: TdrDelay -> double click it -> Set it to A (hexadecimal) or 10 (decimal).
    4. You can also disable it by setting the value to 0, then rebooting.
    5. Now begin testing.

  5. Still no go? Check the PC Power Supply
  6. Chances are that the electrical malfunction could have ruined a part. Take the PC cover off and pull out the Power Supply. If you see any char or smell burned plastic, it should be replaced. The power supply should put out around 12V @ 18 Amps for the video display and if the unit is not up to specs the OS may generate this error.
  7. That didn't help? Try re-seating your Memory Modules
  8. An electrical fault could have fried a RAM module, Turn off your PC, pull the modules and reinstall a single stick at a time then boot, and continue to repeat this process until you have reinstalled all RAM modules. It is very possible for a module to be bad, if so, replace it.
  9. Ok, stumped? Check the Video Card
  10. If you have an extra or older card, try to use that one and see if you continue to have the same issues. After you pull the existing card from the board, look it over to make sure you don't see any capacitors that are bulging or cracked. Of course if you see or smell burnt parts, then replace the card, unless you can repair it. When windows boots back up, it should should load a default driver for the card. If not, follow the manufacturers steps to install it. If you get the same error with this card, then you have eliminated the Video Card as the issue and the fault lies elsewhere, more than likely on the Motherboard(MB) itself. Sorry, a new MB or PC may be needed at this point. If you can troubleshoot the MB and pinpoint the bad part youll save yourself some $$.

    ** This is what happened to a PC I was troubleshooting. I replaced the bad capacitor, afterwords it was good as new!



  11. Lastly, Undo any BIOS or Hardware changes if possible
  12. Attempt to backtrack to your previous configuration and settings. Start over and apply a single change one at a time and reboot.

Hopefully, these tips may help you isolate the issue. In the future, make sure your PC is connected to a Surge Protector or UPS to avoid damage to electrical components during power failures.


Peace be unto you. Thank you for visiting!