POST Beeps
Not all beeps issued by your Inspiron are due to a problem. When your laptop boots up, it runs a series of self-diagnostics to ascertain that all hardware and software necessary for proper operation are present and accounted for. When this test completes, the laptop will issue one or two quick beeps to indicate that this power-on self-test, or POST, was performed successfully.
Dell Beep Codes
If your Inspiron laptop encounters a problem during the POST, it will most likely not boot properly and issue a number of short beeps to report the problem. A single beep indicates possible motherboard failure, while two quick beeps signal a possible problem with your memory chips. Count the beeps and consult your laptop's user's manual to decipher the problem and determine the best solution.
BIOS Beep Codes
In cases where the Inspiron's BIOS cannot detect or communicate with various components, your Dell will emit a series of beeps with a pause between. For example, a single beep followed by a pause, then three beeps and a pause, followed by four beeps and a pause and finally a single beep indicate a possible RAM failure. Your user's manual should offer a chart with common codes and their meanings. The example above would look like 1-3-4-1 on the chart.
Troubleshooting
Some problems reported by the Inspiron's beep codes don't necessarily require professional repair services. Problems with RAM, for example, may occur simply because the RAM chips are not seated properly. In cases like this, remove and reinstall the RAM chip to ensure proper connection. Not all issues are as easy to troubleshoot, so you must determine what issues you are confident in attempting to correct and which problems require professional help.