Acer Aspire 5940g Service Guide

Chapter 4141
Sound Problems
If sound problems are experienced, perform the following actions one at a time to correct the problem.
1. Reboot the computer.
2. Navigate to  Start´ Control  Panel ´ System  and  Maintenance ´ System ´ Device  Manager . 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.
3. Roll back the audio driver to the prev ious...

142Chapter 4
Internal Microphone Failure
If the internal Microphone fails, perform the following actions one at  a time to correct the problem. Do not 
replace a non-defective FRUs:
Microphone Problems
If internal or external  Microphones do no operate correctly, perform the following actions one at a time to 
correct the problem.
1. Check that the microphone is enabled. Navigate to  Start´ Control  Panel ´ Hardware  and  Sound ´ 
Sound  and select the  Recording tab.
2. Right-click on the  Recording tab...

Chapter 4143
HDD Not Operating Correctly
If the HDD does not operate correctly, perform the following ac tions one at a time to correct the problem. 
1. Disconnect all external devices.
2. Run a complete virus scan using up-to-date software to ensure the computer is virus free. 
3. Run the Windows 7 Startup Repair Utility:
a.insert the Windows 7 Operating System  DVD in the ODD and restart the computer. 
b. When prompted, press any key to star t to the operating system DVD. 
c. The Install  Windows...

144Chapter 4
ODD Failure
If the ODD fails, perform the following actions one at a time  to correct the problem. Do not replace a non-
defective FRUs:
ODD Not Operating Correctly
If the  ODD exhibits any of the following symptoms it may be faulty:
• Audio CDs do not play when loaded 
• DVDs do not play when loaded 
• Blank discs do not burn correctly 
• DVD or CD play breaks up or jumps 
• Optical drive not found or not active:  • Not shown in My Computer or the BIOS setup 
• LED does not flash when the...

Chapter 4145
a.Double-click  lDE ATA/ATAPI controllers . If a device displays a down arrow, right-click on the device 
and click  Enable.
b. Double-click  DVD/CD-ROM drives . If the device displays a down arrow, right-click on the device and 
click  Enable .
c. Check that there are no yellow excl amation marks against the items in  l D E  ATA / ATA P I  c o n t r o l l e r s. If 
a device has an exclamation mark, right-click on t he device and uninstall and reinstall the driver.
d. Check that there are...

146Chapter 4
b.Double-click  IDE ATA/ATAPI controllers, then right-click ATA Device 0. 
c. Click  Properties  and select the  Advanced Settings  tab. Ensure that the  Enable DMA  box is 
checked and click  OK. 
d. Repeat for the other ATA Devices shown if applicable.
Drive Not Detected
If Windows cannot detect the drive, perform the foll owing actions one at a time to correct the problem.
1. Restart the computer and press F2 to enter the BIOS Utility. 
2. Check that the drive is detected in the ATAPI...

Chapter 4147
Modem Function Failure
If the internal Modem fails, perform the following actions one at a  time to correct the problem. Do not replace a 
non-defective FRUs:
Wireless Function Failure
If the  WLAN  fails, perform the following actions one at a time to correct the problem. Do not replace a non-
defective FRUs:
START
RJ-11 well
connected?
Modem  wire
well co nnected?
Modem card
well co nnected?
Modem card  OK?
Replace
Main board
Connect it well
Seat it well
Replace
Modem card
Connect it well...

148Chapter 4
Thermal Unit Failure
If the Thermal  Unit  fails, perform the following actions one at a time  to correct the problem. Do not replace a 
non-defective FRUs:
External Mouse Failure
If an external  Mouse fails, perform the following actions one at a time to correct the problem. 
1. Try an alternative mouse.
2. If the mouse uses a wireless connection, insert new  batteries and confirm there is a good connection. See 
the mouse user manual.
3. If the mouse uses a USB connecti on, try an...

Chapter 4149
• No hardware is listed under Other Devices.
13. If the Issue is still not resolved, see “Online Support Information” on page 219.
Other Failures
If the CRT Switch, Dock, LAN Port, external MIC or Speakers, PCI Express Card, 5-in-1 Card Reader or 
Volume Wheel fail, perform the following general steps to  correct the problem. Do not replace a non-defective 
FRUs:
1. Check Drive whether is OK.
2. Check Test Fixture is ok.
3. Swap M/B to Try. 

150Chapter 4
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a 
hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement 
should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1. Run the advanced diagnostic test for the syst em board in loop mode at least 10 times.
2. If no error is detected,  do not replace any FRU.
3....