Keyboard Problems; Lockups And Software Problems; The Computer Does Not Start Up; The Computer Stops Responding - Dell OptiPlex 755 User Manual

Keyboard Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
Check the keyboard cable —
Ensure that the keyboard cable is firmly connected to the computer.
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Shut down the computer (see
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and then restart the computer.
Ensure that the cable is not damaged or frayed and check cable connectors for bent or broken pins. Straighten any bent pins.
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Remove any keyboard extension cables and connect the keyboard directly to the computer.
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Test the keyboard — Connect a properly working keyboard to the computer, then try using the keyboard.
Run the Hardware Troubleshooter —
See Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista® Operating

Lockups and Software Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

The computer does not start up

Check the diagnostic lights —
See Diagnostic Lights.
Ensure that the power cable is firmly connected to the computer and to the electrical outlet

The computer stops responding

NOTICE: You may lose data if you are unable to perform an operating system shutdown.
Turn the computer off — If you are unable to get a response by pressing a key on your keyboard or moving your mouse, press and hold the power button for
at least 8 to 10 seconds (until the computer turns off), and then restart your computer.

A program stops responding

End the program —
1. Press <Ctrl><Shift><Esc> simultaneously to access the Task Manager.
2. Click the Applications tab.
3. Click to select the program that is no longer responding.
4. Click End Task.

A program crashes repeatedly

NOTE: Most software includes installation instructions in its documentation or on a floppy disk, CD, or DVD.
Check the software documentation —
If necessary, uninstall and then reinstall the program.
Before Working Inside Your Computer), reconnect the keyboard cable as shown on the setup diagram for your computer,
Systems.