Joshua Humbert the 3rd and 4th lights on signifies that Memory modules are detected, but a memory failure has occurred. Suggested resolutions:
• If two or more memory modules are installed, remove the modules (see "Removing a Memory Module" in your User’s Guide), then reinstall one module (see "Installing a Memory Module" in your User’s Guide) and
restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
• If available, install working memory of the same type into your computer (see "Memory" in your User’s Guide).
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Check [http://www.dell.com/support/article/us/en/4/SLN288786|on here] for an explanation of the POST codes. Your model is not listed but the same codes apply.
the 3rd and 4th lights on signifies that Memory modules are detected, but a memory failure has occurred. Suggested resolutions:
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Joshua Humbert the 3rd and 4th lights on signifies that Memory modules are detected, but a memory failure has occurred. Suggested resolutions:
• If two or more memory modules are installed, remove the modules (see "Removing a Memory Module" in your User’s Guide), then reinstall one module (see "Installing a Memory Module" in your User’s Guide) and
restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
• If available, install working memory of the same type into your computer (see "Memory" in your User’s Guide).
the 3rd and 4th lights on signifies that Memory modules are detected, but a memory failure has occurred. Suggested resolutions:
• If two or more memory modules are installed, remove the modules (see "Removing a Memory Module" in your User’s Guide), then reinstall one module (see "Installing a Memory Module" in your User’s Guide) and
restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
• If available, install working memory of the same type into your computer (see "Memory" in your User’s Guide).