Dell OptiPlex GX520 - Problems Writing to a CD;DVD-RW Drive; Hard Drive Problems; Keyboard Problems

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Problems writing to a CD/DVD-RW drive
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Hard drive problems
Keyboard Problems
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AdjusttheWindowsvolumecontrol—
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l Click the speaker icon in the lower-right corner of your screen.
l Ensure that the volume is turned up by clicking the slidebar and dragging it up.
l Ensure that the sound is not muted by clicking any boxes that are checked.
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Checkthespeakersandsubwoofer— See "Sound and Speaker Problems."
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Closeotherprograms— The CD/DVD-RW drive must receive a steady stream of data when writing. If the stream is interrupted, an error
occurs. Try closing all programs before you write to the CD/DVD-RW.
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Turn off Standby mode in Windows before writing to a CD/DVD-RWdisc— See "Power Management."
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RunningtheDellIDEHardDriveDiagnostics —
The Dell IDE Hard Drive Diagnostics is a utility that tests the hard drive to troubleshoot or confirm a hard drive failure.
1. Turn on your computer (if your computer is already on, restart it).
2.  When F2 = Setup appears in the upper-right corner of the screen, press <Ctrl><Alt><d>.
3. Follow the instructions on the screen.
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RunCheckDisk— 
1. Click the Start button and click My Computer.
2. Right-click Local Disk C:.
3. Click Properties.
4. Click the Tools tab.
5. Under Error-checking, click Check Now.
6. Click Scan for and attempt recovery of bad sectors.
7. Click Start.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
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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, reconnect the keyboard cable as shown in the Quick Reference Guide for your computer, and then restart the
computer.
l Check the cable connector for bent or broken pins and for damaged or frayed cables. Straighten bent pins.
l Remove 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, and try using the keyboard. If the new keyboard works, the
original keyboard is faulty.
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Run the Dell Diagnostics
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