What to do if my Dell NOT21990 Laptop has LCD failure (EC detection of power rail failure)?
If your Dell Laptop's LCD fails due to EC detection of a power rail failure, you should replace the system board.
How to fix a Dell Laptop when no memory/RAM is detected?
If your Dell Laptop isn't detecting memory/RAM, first confirm that the memory module is properly installed. If the problem continues, replace the memory module.
How to fix WiFi connectivity issues on a Dell NOT21990?
If you are experiencing WiFi connectivity issues with your Dell Laptop, try performing a WiFi power cycle.
What to do if Dell Laptop LCD failure (EC detection of power rail failure)?
If your Dell Laptop's LCD fails due to EC detection of a power rail failure, the system board should be replaced.
How to fix no memory/RAM detected on Dell Laptop?
If your Dell Laptop is not detecting memory or RAM, first ensure that the memory module is correctly installed. If the problem continues, try replacing the memory module.
What to do if Dell Laptop says invalid memory installed?
If your Dell laptop indicates that invalid memory is installed, try resetting and swapping the memory modules among the slots. If the problem persists after this, consider replacing the memory module.
How to return swollen battery to Dell NOT21990 under warranty?
If you have a swollen battery covered under warranty for your Dell Laptop, return it to Dell in an approved shipping container provided by Dell.
How to resolve SBIOS flash corruption on a Dell NOT21990 Laptop?
To resolve SBIOS flash corruption on your Dell Laptop, flash the latest BIOS version. If the problem continues, replace the system board.
What to do if flash corruption is detected by SBIOS in my Dell NOT21990 Laptop?
If SBIOS detects flash corruption on your Dell Laptop, try the following steps: First, press and hold the power button for over 25 seconds to perform an RTC reset. If that doesn't work, disconnect all power sources (AC adapter, battery, and coin cell) and drain flea power by pressing and holding the power button for 3 to 5 seconds. As a last resort, you may need to replace the system board.
What to do if my Dell NOT21990 Laptop does not power on?
If your Dell Laptop does not power on or boot into the operating system, perform a hard reset to drain residual flea power.
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