Category: Laptop and Desktop Repair and service
Contents of this article
- Optical mouse problems
- Audio problems
- Bluetooth problems
LENOVO ThinkCentre M73
TROUBLESHOOTING
No audio in Windows
Actions:
# If you are using powered external speakers that have an On/Off control, verify that the On/Off control is set to the On position and the speaker power cable is connected to a properly grounded, functional ac electrical outlet.
# If your external speakers have a volume control, verify that the volume control is not set too low.
# Click the speaker icon in the Windows desktop notification area. A volume-control window opens. Press
Mixer to open the Volume Mixer window. Verify that the speaker mute buttons are not pressed and the
volume settings are not set too low.
# Some models have a front audio panel you can use to adjust volume. If you have a front audio panel, verify that the volume is not set too low.
# Verify that your external speakers (and headphones, if used) are connected to the correct audio connector on the computer. Most speaker cables are color-coded to match the connector.
Note: When external-speaker or headphone cables are attached to the audio connector, the internal speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion slots, the audio function built into the system board is disabled; use the audio jacks on the adapter
Actions:
# If you are using powered external speakers that have an On/Off control, verify that the On/Off control is set to the On position and the speaker power cable is connected to a properly grounded, functional ac electrical outlet.
# If your external speakers have a volume control, verify that the volume control is not set too low.
# Click the speaker icon in the Windows desktop notification area. A volume-control window opens. Press
Mixer to open the Volume Mixer window. Verify that the speaker mute buttons are not pressed and the
volume settings are not set too low.
# Some models have a front audio panel you can use to adjust volume. If you have a front audio panel, verify that the volume is not set too low.
# Verify that your external speakers (and headphones, if used) are connected to the correct audio connector on the computer. Most speaker cables are color-coded to match the connector.
Note: When external-speaker or headphone cables are attached to the audio connector, the internal speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion slots, the audio function built into the system board is disabled; use the audio jacks on the adapter
Sound comes from one external
speaker only
Actions:
# Ensure that the speaker cable is inserted completely into the connector on the computer.
# Ensure that the cable that attaches the left speaker to the right speaker is securely connected.
# Right-click the speaker icon in the Windows desktop notification area, and then click Play back devices.
Click the Playback tab, select Speakers, and then click Properties. Click Balance on theLevels tab, and verify that the Balance setting is set correctly.
Actions:
# Ensure that the speaker cable is inserted completely into the connector on the computer.
# Ensure that the cable that attaches the left speaker to the right speaker is securely connected.
# Right-click the speaker icon in the Windows desktop notification area, and then click Play back devices.
Click the Playback tab, select Speakers, and then click Properties. Click Balance on theLevels tab, and verify that the Balance setting is set correctly.
CD or DVD does not work
Actions:
# Verify that the disc is inserted correctly, with its label up.
# Ensure that the disc you are using is clean. To remove dust or fingerprints, wipe the disc clean with a soft cloth from the center to the outside. Wiping a disc in a circular motion might cause loss of data.
# Verify that the disc you are using is not scratched or damaged. Try inserting another disc that you know is good. If you cannot read from a known-good disc, you might have a problem with your CD or DVD drive or the cabling to your CD or DVD drive. Ensure that the power cable and signal cable are securely connected to the drive
Actions:
# Verify that the disc is inserted correctly, with its label up.
# Ensure that the disc you are using is clean. To remove dust or fingerprints, wipe the disc clean with a soft cloth from the center to the outside. Wiping a disc in a circular motion might cause loss of data.
# Verify that the disc you are using is not scratched or damaged. Try inserting another disc that you know is good. If you cannot read from a known-good disc, you might have a problem with your CD or DVD drive or the cabling to your CD or DVD drive. Ensure that the power cable and signal cable are securely connected to the drive
Intermittent problems
Actions:
# Verify that all cables and cords are securely connected to the computer and attached devices.
# Verify that when the computer is on, the fan grill is not blocked (there is air flow around the grill), and the fans are working. If airflow is blocked or the fans are not working, the computer might overheat.
# If SCSI devices are installed, verify that the last external device in each SCSI chain is terminated correctly. (See your SCSI documentation.
Actions:
# Verify that all cables and cords are securely connected to the computer and attached devices.
# Verify that when the computer is on, the fan grill is not blocked (there is air flow around the grill), and the fans are working. If airflow is blocked or the fans are not working, the computer might overheat.
# If SCSI devices are installed, verify that the last external device in each SCSI chain is terminated correctly. (See your SCSI documentation.
All or some keys on the key board
do not work
Actions:
# Verify that the key board cable is securely connected to the correct connector on the computer.
# If you are using an Enhanced Performance USB key board and one or more of the Rapid Access buttons are the only keys that are not working ,these buttons might have been disabled or have not been assigned
Actions:
# Verify that the key board cable is securely connected to the correct connector on the computer.
# If you are using an Enhanced Performance USB key board and one or more of the Rapid Access buttons are the only keys that are not working ,these buttons might have been disabled or have not been assigned
The mouse or pointing device does
not work
Actions:
# Verify that the mouse or pointing-device cable is securely attached to the correct connect or on the computer. Depending on the type of mouse you have, the mouse cable will connect to either the mouse, serial, or USB connector. Some key boards have integrated USB connectors that can be used for a USB mouse or pointing device.
# Verify that the device drivers for the mouse or pointing device are installed correctly.
# If you are using a USB key board or mouse, verify that the USB connectors are enabled in the BIOS settings
Actions:
# Verify that the mouse or pointing-device cable is securely attached to the correct connect or on the computer. Depending on the type of mouse you have, the mouse cable will connect to either the mouse, serial, or USB connector. Some key boards have integrated USB connectors that can be used for a USB mouse or pointing device.
# Verify that the device drivers for the mouse or pointing device are installed correctly.
# If you are using a USB key board or mouse, verify that the USB connectors are enabled in the BIOS settings
Optical mouse
This section provides instructions on how to clean an optical mouse.
An optical mouse uses a light-emitting diode(LED)and an optical sensor to navigate the pointer. If the pointer on the screen does not move smoothly with the optical mouse, you might need to clean the mouse.
To clean an optical mouse, do the following:
1. Turn off your computer.
2. Disconnect the mouse cable from the computer.
3. Turn the mouse upside down to check the lens.
a. If there is a smudge on the lens,gently clean the area with a plain cotton-tipped swab.
b. If there is debris in the lens, gently blow the debris away from the area.
This section provides instructions on how to clean an optical mouse.
An optical mouse uses a light-emitting diode(LED)and an optical sensor to navigate the pointer. If the pointer on the screen does not move smoothly with the optical mouse, you might need to clean the mouse.
To clean an optical mouse, do the following:
1. Turn off your computer.
2. Disconnect the mouse cable from the computer.
3. Turn the mouse upside down to check the lens.
a. If there is a smudge on the lens,gently clean the area with a plain cotton-tipped swab.
b. If there is debris in the lens, gently blow the debris away from the area.
4. Check the surface on which you are using
the mouse. If you have a very intricate picture or pattern beneath the mouse,
it may be difficult for the digital signal processor (DSP) to determine changes
in the mouse position.
5. Reconnect the mouse cable to the computer.
6. Turn your computer back on.
5. Reconnect the mouse cable to the computer.
6. Turn your computer back on.
The fingerprint reader does not
work
Action: The following could cause the fingerprint reader not to operate properly:
# Not enrolling your fingerprint correctly.
# Scratching the surface of the reader with a hard, pointed object.
# Scraping the surface of the reader with your nail or anything hard.
# Using or touching the reader with a dirty finger.
# The surface of your finger is very different from when you enrolled your fingerprint.
Action: The following could cause the fingerprint reader not to operate properly:
# Not enrolling your fingerprint correctly.
# Scratching the surface of the reader with a hard, pointed object.
# Scraping the surface of the reader with your nail or anything hard.
# Using or touching the reader with a dirty finger.
# The surface of your finger is very different from when you enrolled your fingerprint.
Bluetooth problem
Symptom: Sound does not come from the Bluetooth headset or headphone but comes from the local speaker even though the headset or headphone is connected using the Headset profile or AV profile.
Action: Do the following:
1. Exit the application that uses the sound device (for example, Windows Media Player).
2. Open Control Panel.
3. Click Hardware and Sound > Sound.
4. Select the Playback tab.
5. If you are using the Headset profile, select Bluetooth Hands-free Audio and click the Set Default button. If you are using the AV profile, select Stereo Audio and click the Set Default button.
6. Click OK to close the Sound window.
Symptom: Sound does not come from the Bluetooth headset or headphone but comes from the local speaker even though the headset or headphone is connected using the Headset profile or AV profile.
Action: Do the following:
1. Exit the application that uses the sound device (for example, Windows Media Player).
2. Open Control Panel.
3. Click Hardware and Sound > Sound.
4. Select the Playback tab.
5. If you are using the Headset profile, select Bluetooth Hands-free Audio and click the Set Default button. If you are using the AV profile, select Stereo Audio and click the Set Default button.
6. Click OK to close the Sound window.
USB problems
Symptom: The USB connectors cannot be accessed.
Actions:
# Ensure that the USB cable is securely connected to the USB connector and to the USB device. If the USB
device has its own power cord, ensure that it is attached to a properly grounded electrical outlet.
# If the USB device has its own On/Off switch, ensure that it is in the On position.
# If the USB device has an Online switch, ensure that it is in the Online position.
# If the USB device is a printer, ensure that paper is loaded correctly.
# Ensure that any device drivers or other software supplied with the USB device is correctly installed.
# Reset the device by detaching and reattaching the USB connector.
Symptom: The USB connectors cannot be accessed.
Actions:
# Ensure that the USB cable is securely connected to the USB connector and to the USB device. If the USB
device has its own power cord, ensure that it is attached to a properly grounded electrical outlet.
# If the USB device has its own On/Off switch, ensure that it is in the On position.
# If the USB device has an Online switch, ensure that it is in the Online position.
# If the USB device is a printer, ensure that paper is loaded correctly.
# Ensure that any device drivers or other software supplied with the USB device is correctly installed.
# Reset the device by detaching and reattaching the USB connector.
