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8	8	* Dell Dimension - 4 LEDs on the back with A B C D labels that either light up green, amber, or not at all; error codes listed [[here>>url:https://www.manualslib.com/manual/227494/Dell-Dimension-2400-Series.html?page=35||rel="__blank"]]
9	9	* Dell OptiPlex - 4 LED numbers visible near audio input/output jacks; error codes listed [[here>>url:http://www.dell.com/support/article/us/en/19/SLN284978/a-reference-guide-to-the-dell-optiplex-diagnostic-indicators?lang=EN#2005_to_2009||rel="__blank" title="Dell OptiPlex error codes"]]
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12	12	__Hard Drives__:
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14	14	* The "clicking of death" - Hard drive problem where the hard drive makes a distinct clicking or scraping noise telling that the hard drive is most likely damaged beyond repair. [[https:~~/~~/acsdata.com/hard-drive-click-of-death/>>url:https://acsdata.com/hard-drive-click-of-death/]]
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22	22	(((
23	23	__Motherboard/Power Unit__: Dell Dimension 2400- unlisted LED code implies that either the motherboard or power unit is malfunctioning
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	24	+__Bios: __
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	27	+* Administrator password blocks Bios changes - either remove the battery or the CMOS jumper (should say CLRPWD or CLEAR or PASSWORD next to it on the motherboard)
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24	24	)))
25	25	)))
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