Dell 720H2C Memory Problems , Mouse Problems

3. Follow the instructions on the screen.
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A solid blue screen appears
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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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Other software problems
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Check the software documentation or contact the software manufacturer for troubleshooting information —
lEnsure that the program is compatible with the operating system installed on your computer.
lEnsure that your computer meets the minimum hardware requirements needed to run the software. See the software documentation for information.
lEnsure that the program is installed and configured properly.
lVerify that the device drivers do not conflict with the program.
lIf necessary, uninstall and then reinstall the program.
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Back up your files immediately 
Use a virus-scanning program to check the hard drive, floppy disks, CDs, or DVDs 
Save and close any open files or programs and shut down your computer through the Start menu 
Memory Problems
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If you receive an insufficient memory message — 
lSave and close any open files and exit any open programs you are not using to see if that resolves the problem.
lSee the software documentation for minimum memory requirements. If necessary, install additional memory (see Installing Memory).
lReseat the memory modules (see Memory) to ensure that your computer is successfully communicating with the memory.
lRun the Dell Diagnostics (see Dell Diagnostics).
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If you experience other memory problems — 
lReseat the memory modules (see Memory) to ensure that your computer is successfully communicating with the memory.
lEnsure that you are following the memory installation guidelines (see Installing Memory).
lEnsure that the memory you are using is supported by your computer. For more information about the type of memory supported by your computer,
see Memory.
lRun the Dell Diagnostics (see Dell Diagnostics).
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Mouse Problems
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Check the mouse cable — 
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 mouse extension cables, and connect the mouse directly to the computer.
lVerify that the mouse cable is connected as shown on the setup diagram for your computer.
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Restart the computer — 
1. Simultaneously press <Ctrl><Esc> to display the Start menu.
2. Press <u>, press the up- and down-arrow keys to highlight Shut down or Turn Off, and then press <Enter>.
3. After the computer turns off, reconnect the mouse cable as shown on the setup diagram.
4. Turn on the computer.
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Test the mouse — Connect a properly working mouse to the computer, then try using the mouse.
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CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.