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Possible Solution (s) Motherboard / System Board Fault. Identify the correct flashing light sequence. For diagnosing LED light codes you need to: Power on the laptop or restart it if it is already on.I unscrewed the back of the laptop, pulled the back off, pulled the RAM and moved it to an open memory slot. That code is a "4 and 2" or a "2 and 4" depending on how you look at it and that told me the memory was bad. It was flashing 4 white then a pause then 2 yellow in a rhythmic fashion over and over again.We are a trusted supplier to 1000s of schools, government agencies, military and repair shops worldwide. We are a leading supplier of Dell replacement parts and stock all laptop repair parts needed to repair your Dell laptop.

Parts-People has been specializing in Dell laptops for 17 years.4) Laptop boots, external display shows Windows login, front LED keeps flashing. 2) I open the laptop lid, then press power button, then close lid before Dell logo shows) 3) Front LED starts flashing during BIOS routine. 1) Laptop is off, external display connected via USB-C to HDMI adapter (tried different adapters).i was in the middle of install windows and then all of sudden blue screen of death and then now this. When ever i start the computer it lights up the screen but no dell logo and then starts to blink the caps lock led then shuts off 10 or so seconds later.