Dell OptiPlex 740 - Manual (Page 60)

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Quick Reference Guide
If your computer beeps during start-up:
1 Write down the beep code.
2 See "Dell Diagnostics" on page 51 to identify a more serious cause.
3 Contact Dell for technical assistance. For information on contacting Dell,
see your online User’s Guide.
Resolving Software and Hardware Incompatibilities
If a device is either not detected during the operating system setup or is
detected but incorrectly configured, you can use the Hardware
Troubleshooter to resolve the incompatibility.
Windows Vista
1 Click Start and click Help and Support.
2 Type hardware troubleshooter in the search field and press
to start the search.
In the search results, select the option that best describes the problem and
follow the remaining troubleshooting steps.
Windows XP
1 Click Start → Help and Support.
2 Type hardware troubleshooter in the search field and press
to start the search.
3 In the Fix a Problem section, click Hardware Troubleshooter.
4 In the Hardware Troubleshooter list, select the option that best describes
the problem and click Next to follow the remaining troubleshooting steps.
Code Cause
2 short, 1 long BIOS checksum error
1 long, 2 short Memory test failure (bad memory during memory sizing)
1 long, 3 short, 2 short No memory
1 short key pressed