Runtime error for atibtmon.exe when disconnecting AC power cord

Hi Junior Mayhe,

Thank you for posting your question in Microsoft Community.

I can understand the inconvenience caused to you. I will help you to resolve the issue!

Have you made any changes to the computer?

What is the exact error message you’re getting?

 I would suggest you to Boot the computer in Safe mode and perform a clean boot to check if any third party application is causing the issue, as clean boot helps in eliminating software conflicts. Follow these to start the computer in clean boot.

Method 1:

Follow these steps; check if the issue persists in safe mode.

a) Insert the Windows 8 Release Preview Installation Disc; click on Repair your System.

b) Click on Advanced Startup Options.

c) Click on Windows Startup Settings.

d) Select safe mode and then presenter.

Method 2:

Clean boot.

Step 1:

 a) Press the ‘Windows + R’ key on the keyboard.

b) In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.

c) Click the ‘Boot’ tab and uncheck ‘Safe Boot’ option.

d) On the ‘General’ tab, click to select the option ‘Selective startup’, and then click to clear the option Load startup items check box.

e) On the ‘Services’ tab, click to select the ‘Hide all Microsoft services’ check box, and then click ‘Disable all’.

f) On the ‘StartUp’ tab, click ‘Open Task Manager’. In the Task Manager window under startup tab, right click on each startup item which are enabled and select ‘Disable’.

g) Click ‘OK’, and then click Restart.

Step 2: Enable half of the services

 a. Follow steps 1a and 1b to start the System Configuration utility.

b. Click the Services tab, and then click to select the Hide all Microsoft services check box.

c. Click to select half of the check boxes in the Service list.

d. Click OK, and then click Restart.

Step 3: Determine whether the problem returns

 If the problem still occurs, repeat step 1 and step 2. In step 2, click to clear half of the check boxes that you originally selected in the Service list.

If the problem does not occur, repeat step 1 and step 2. In step 2, select only half of the remaining check boxes that are cleared in the Service list. Repeat these steps until you have selected all the check boxes.

If only one service is selected in the Service list, and you still experience the problem, the selected service causes the problem. Go to step 6. If no service causes this problem, go to step 4.

Step 4: Enable half of the Startup items

 If no startup item causes this problem, a Microsoft service most likely causes the problem. To determine which Microsoft service may be causing the problem, repeat step 1 and step 2 without selecting the Hide all Microsoft services check box in either step.

Step 5: Determine whether the problem returns

 If the problem still occurs, repeat step 1 and step 4. In step 4, click to clear half of the check boxes that you originally selected in the Startup Item list.

If the problem does not occur, repeat step 1 and step 4. In step 4, select only half of the remaining check boxes that are cleared in the Startup Item list. Repeat these steps until you have selected all the check boxes.

If only one startup item is selected in the Startup Item list, and you still experience the problem, the startup item that is selected in the list is the service that is causing the problem.

Go to step 6.

If no startup item causes this problem, a Microsoft service most likely causes the problem. To determine which Microsoft service may be causing the problem, repeat step 1 and step 2 without selecting the Hide all Microsoft services check box in either step.

Step 6: Resolve the problem

 After you determine the startup item or the service that causes the problem, contact the program manufacturer to determine whether the problem can be resolved. Or, run the System Configuration utility, and then click to clear the check box for the problem item.

Step 7:

Note: After you have finished troubleshooting, follow these steps to boot to normal startup.

a) Press the ‘Windows + R’ key on the keyboard.

b) In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.

c) On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.

d) When you are prompted to restart the computer, click ‘Restart’.

If issue still persist I would suggest you to follow the below provided method.

Try the general troubleshooting methods and check after each method:

Method 3: Start the computer in “Clean boot”, to disable startup programs .

a) Press the ‘Windows + R’ key on the keyboard.

b) In the ‘Run’ windows type’MSCONFIG’ and click ‘Ok’.

c) Click the ‘Boot’ tab and uncheck‘Safe Boot’ option.

d) On the ‘General’ tab, click to select the option**‘Selective startup’**, and then click to clear the option Load startup items check box.

e) On the ‘Services’ tab, click to select the ‘Hide all Microsoft services’ check box, and then click ‘Disable all’.

f) On the ‘Startup’ tab, click ‘Open **Task Manager’.**In the Task Manager window under startup tab, right click on “atibtmon.exe” which are enabled and select ‘Disable’.

g) Click ‘OK’, and then click Restart.

Note: After you have finished troubleshooting, follow these steps to boot to normal startup.

a) Press the **‘**Windows + R’ key on the keyboard.

b) In the ‘Run’windows type’ MSCONFIG’ and click ‘Ok’.

c) On the ‘General’ tab, click the**‘Normal Startup’** option, and then click ‘OK’.

d) When you are prompted to restart the computer**, click‘Restart’**.

Please Let us know if you have any questions. We will be glad to provide you with the additional Options.

Junior, 

I have the same problem too.  This is due to ATI's Brightness Monitor which is part of the current Catalyst drivers.  At this point, as of November 2012, ATI & AMD have not acknowledged that this error exists, and no fix is available other than uninstalling your ATI Video drivers, which of course is not an option, so we will have to deal with this annoyance until ATI addresses the error in the next driver update.

K.Sully

Windows Vista 64-Bit

HP DV4-2145DX (Mobile)

Turion II M520 2.3Ghz (Mobile)

ATI Radeon HD 4200 (Mobile)