Diagnostics
This chapter details the built in troubleshooting features to diagnose the Dell systems. It also lists the invoking instructions along with
related information for each diagnostics method.
Topics:
• Battery Status Lights
• Wi-Fi power cycle
• Diagnostic LEDs
• M-BIST
• Self-Heal
• BIOS recovery
• LCD Built-in Self Test
• ePSA Diagnostics
Battery Status Lights
If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately blinking
amber light and
green light
An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop.
Alternately blinking
amber light with
steady green light
Temporary battery failure with AC adapter present.
Constantly blinking
amber light
Fatal battery failure with AC adapter present.
Light o Battery in full charge mode with AC adapter present.
green light on Battery in charge mode with AC adapter present.
Wi-Fi power cycle
If your computer is unable to access the internet due to Wi-Fi connectivity issues a Wi-Fi power cycle procedure may be performed. The
following procedure provides the instructions on how to conduct a Wi-Fi power cycle:
NOTE
: Some ISPs (Internet Service Providers) provide a modem/router combo device.
1 Turn o your computer.
2 Turn o the modem.
3 Turn o the wireless router.
4 Wait for 30 seconds.
5 Turn on the wireless router.
6 Turn on the modem.
7 Turn on your computer.
7
Diagnostics 143
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