Hi there . don't worry its a simple issue . I had gone through this problem.initially i got frustrated cuz of it but when i troubleshoot it i found that there was a problem with my laptop's ram it may be bad but this happens in rare cases its best solution is just remove your ram and clean its terminal with rubber . And clean the inner terminals of the ram slot inside the laptop with some brush tools or something like that but be carefull . Now after cleaning put the ram back in. And tirn it on . Here you go.

It is your laptop's "check engine" light. ;-)

Does the laptop work fine on just the charger? · By the way the LED is amber not orange. · From Dell - “Blinking amber indicates that the system board cannot start initialization or in an S3 power state. There is a power problem, a device may be malfunctioning or incorrectly installed.” · Have you run the Dell Diagnostics yet ? Tap the F12 key at the Dell splash screen on start-up. Choose Diagnostics from the menu. · If all works fine with the battery removed with just the charger, and with the information you have given, I would suggest that the battery is dead. I would also suggest getting a genuine DELL battery, if you can. · Don’t forget to check voltage on CMOS battery as well - should be 3V. · I can’t remember if that model uses IDE or SATA hard drive interface. · https://downloads.dell.com/manuals/all-p...

That is also the hard drive activity light. The FN+H keys toggle between power and battery-status light/hard-drive activity light. Try that to see if it still blinks. Inspiron 15 3000 Setup and Specifications | Dell US

There are two Green LED charger indicators; one on the charger itself, and one on the laptop indicating a charger is connected.

The one on the charger should be on solid as long as it is plugged in and receiving power. If that LED is blinking when it is plugged in, it means the charger is defective. Replace or borrow another to confirm.

If the charger indicator LED on the laptop is blinking (while the charger LED itself is on and plugged into the laptop properly) then most likely the power jack is bad. This happens when the charger plug repeatedly flexes the laptop's power jack during normal use - like bumping or pushing the charger plug against the laptop. The laptop power jack is relatively inexpensive (like $3) but depending on the laptop, takes significant labor to access and replace (like 30 minutes for the occasional hacker).

It is possible, but less likely to be a motherboard issue - where a section of it controls the power logic, deciding whether to get the power from the battery or charger input.

Hi everyone, If your Dell laptop won’t power on and you notice the white LED lights up for a second and then turns off, here’s what it means and what you can try.What Does This Indicate?This usually points to a power-related issue, it could be the adapter, battery, DC jack, or in some cases, the motherboard. Troubleshooting Steps Try these steps in order: Perform a Hard Reset Disconnect the AC adapter and remove the battery (if removable). Press and hold the power button for 30 seconds to drain residual power. Reconnect the battery and adapter, then try powering on. Check the Power Adapter Ensure the adapter light is on and stable. If possible, test with another Dell-compatible adapter. Inspect the Charging Port Make sure it’s clean and free of debris. A damaged DC jack can prevent proper charging. Run Built-in Diagnostics If the system powers on briefly, tap F12 at startup and select Diagnostics. If you only get a white screen when holding D during power-on, that’s the LCD test, which means the display works. Reset BIOS (if accessible) Enter BIOS (F2 or F12 at startup) and load default settings. If you can’t access BIOS, skip this step. Check RAM Reseat or test RAM modules one at a time. Refer to this video for a visual walkthrough:  No Power Troubleshooting Next Steps – If none of the above worked: If your product is under warranty:Click the Get Help Now button at the bottom-right corner of this page to chat with Dell Tech Support for immediate assistance. If out of warranty:The issue may be with the motherboard or charging circuit, which requires professional repair.

please focus on led light, need to see the pattern, dont look else where ,you laptop is telling you where is the fault