Common Problems

Use the following procedure as a guide for computer problems.

NOTE: The diagnostic tests are intended to test only Acer products. Non-Acer products, prototype cards, or modified options can give false errors and invalid system responses.

  1. Obtain the failing symptoms in as much detail as possible.
  2. Verify the symptoms by attempting to re-create the failure by running the diagnostic test or by repeating the same operation.
3. Use the following table with the verified symptom to determine which page to go to.

Symptoms (Verified)

Go To

Power On Issue

Page 138

No Display Issue

Page 139

LCD Failure

Page 141

Internal Keyboard Failure

Page 142

TouchPad Failure

Page 143

Internal Speaker Failure

Page 144

Internal Microphone Failure

Page 146

Rightside USB Failure

Page 148

Modem Failure

Page 149

Other Functions Failure

Page 150

Intermittent Failures

Page 151

Undermined Failures

Page 151

  1. If the Issue is still not resolved, see "Online Support Information" on page 189.
  2. If the Issue is still not resolved, see "Online Support Information" on page 189.

Power On Issue

Workflow Diagram With Decisions

Computer Shuts down Intermittently

If the system powers off at intervals, perform the following actions one at a time to correct the problem.

  1. Check the power cable is properly connected to the computer and the electrical outlet.
  2. Remove any extension cables between the computer and the outlet.
  3. Remove any surge protectors between the computer and the electrical outlet. Plug the computer directly into a known good electrical outlet.
  4. Remove all external and non-essential hardware connected to the computer that are not necessary to boot the computer to the failure point.
  5. Remove any recently installed software.
  6. If the Issue is still not resolved, see "Online Support Information" on page 189.

No Display Issue

Aspire One Ao751h Jm11

No POST or Video

If the POST or video doesn't display, perform the following actions one at a time to correct the problem.

  1. Make sure that the internal display is selected. On this notebook model, switching between the internal display and the external display is done by pressing Fn+F5. Reference Product pages for specific model procedures.
  2. Make sure the computer has power by checking at least one of the following occurs:
  • Fans start up
  • Status LEDs light up

If there is no power, see "Power On Issue" on page 138.

  1. Drain any stored power by removing the power cable and battery and holding down the power button for 10 seconds. Reconnect the power and reboot the computer.
  2. Connect an external monitor to the computer and switch between the internal display and the external display is by pressing Fn+F5 (on this model).

If the POST or video appears on the external display, see "LCD Failure" on page 141.

5. Disconnect power and all external devices including port replicators or docking stations. Remove any memory cards and CD/DVD discs. Restart the computer.

If the computer boots correctly, add the devices one by one until the failure point is discovered.

  1. Reseat the memory modules.
  2. Remove the drives (see "Disassembly Process" on page 42).
  3. If the Issue is still not resolved, see "Online Support Information" on page 189.

Abnormal Video Display

  1. If permanent vertical/horizontal lines or dark spots display in the same location, the LCD is faulty and should be replaced. See "Disassembly Process" on page 42.
  2. If extensive pixel damage is present (different colored spots in the same locations on the screen), the LCD is faulty and should be replaced. See "Disassembly Process" on page 42.
  3. Adjust the brightness to its highest level. See the User Manual for instructions on adjusting settings. NOTE: Ensure that the computer is not running on battery alone as this may reduce display brightness.

If the display is too dim at the highest brightness setting, the LCD is faulty and should be replaced. See "Disassembly Process" on page 42.

  1. Check the display resolution is correctly configured:
  2. Minimize or close all Windows.
  3. If display size is only abnormal in an application, check the view settings and control/mouse wheel zoom feature in the application.
  4. If desktop display resolution is not normal, right-click on the desktop and select Personalized Display Settings.
  5. Click and drag the Resolution slider to the desired resolution.
  6. Click Apply and check the display. Readjust if necessary.
  7. Roll back the video driver to the previous version if updated.
  8. Remove and reinstall the video driver.
  9. Check the Device Manager to determine that:
  • The device is properly installed. There are no red Xs or yellow exclamation marks.
  • There are no device conflicts.
  • No hardware is listed under Other Devices.
  1. If the Issue is still not resolved, see "Online Support Information" on page 189.
  2. Run the Windows Memory Diagnostic from the operating system DVD and follow the onscreen prompts.
  3. If the Issue is still not resolved, see "Online Support Information" on page 189.
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