Dell 760 Keyboard Problems , Lockups and Software Problems

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If you have problems with a Dell IEEE 1394 device —
Contact Dell (see Contacting Dell).
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If you have problems with an IEEE 1394 device not provided by Dell — ContacttheIEEE1394devicemanufacturer.
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Keyboard Problems
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Check the keyboard cable — 
lEnsure that the keyboard cable is firmly connected to the computer.
lShut down the computer (see Before Working on Your Computer), reconnect the keyboard cable as shown on the setup diagram for your computer, and
then restart the computer.
lEnsure that the cable is not damaged or frayed and check cable connectors for bent or broken pins. Straighten any bent pins.
l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.
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Run the Hardware Troubleshooter —
See Hardware Troubleshooter.
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Lockups and Software Problems
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The computer does not start up
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Check the diagnostic lights —
See Diagnostic Lights.
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Ensure that the power cable is firmly connected to the computer and to the electrical outlet 
The computer stops responding
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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.
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A program stops responding
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End the program —
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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.
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WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage on www.dell.com at www.dell.com/regulatory_compliance.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage on www.dell.com at www.dell.com/regulatory_compliance.
CAUTION: You may lose data if you are unable to perform an operating system shutdown.