Im sorry to inform you that the motherboard on your computer needs to be replaced. If the ac adapter light turns on if not plugged into the system and when you do plug it in, it dims or flashes, that's a right out symptom that the motherboard needs to be replaced. Do you still have warranty for that system? if you do, call Dell Tech Support and have them replace it. If the warranty is already expired, please call Dell at 1-800-2884410 for an estimate on how much it would cost you to have the motherboard replaced. Usually would be around $400 - $500 and 5-8 business days. Unfortunately, you have to ship the system back to Dell for that repair.
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Either the power supply has a loose connection or is faulty. You can try removing the battery pack, press and hold power button for 3 seconds and then put battery back in and see if it corrects the problem. You can test power output from the supply to see if it is putting out the voltage it states it should on the label of supply.
Verify that you obtained an exact replacement power adapter for the Dell. If it is an exact replacement then try this. Disconnect power adapter. Remove battery. Reconnect power adapter without the battery. If it turns on, then power off and place battery back in. Then try again. If problem returns, there could be a problem with the battery itself.
The battery may be bad or the charging mechanism of the battery area. OR you may have some undocked (battery run setting) that is dimming the screen or turning off the monitor when you are running on battery where you think it is off but the screen needs to be lightened or powered on.
I would first take a look at your Power Settings in the control panel and see what they are set to.
The fact that the LED light on the power supply tells me that its receiving power, look where the AC adapter goes and check the pin to see if it is loose, this sounds like feedback from the computer causing the power supply light to dim or go out
My plug for the AC adaptor only works when I press it in. I am pretty sure it is the power jack on the PC. I don't know how to take it apart to that level to see if it can just be re soldered or not. I really would like to fix this myself so if anyone has any links to fixing the power jack on a Dell Inspiron B130 let me know.