Hi Soc23,

Welcome to Dell Community Forum.

Try the following steps in order to resolve the issue you are facing with your Dell Inspiron N5040.

• Connect the AC adapter to a known good power outlet. Check Power LED indicator on AC Adaptor (without plugging into the Notebook).  
• If LED on the AC adapter is not lit (when unplugged from notebook), reseat brick and cable.
• Check if LED on the AC Adapter goes off  after connecting to notebook or it remains on.
• If LED on the AC Adapter is ON after connecting to notebook, remove external peripherals, Battery and Drain Flea power. Try to power on the laptop again.
• Try a different known good AC Adapter to see if the system powers on with the same.
• Additionally, click on this link for troubleshooting No Power Issues on your Dell laptop: http://dell.to/167QpcU

Please keep us posted on the results. We would be happy to help in case you need further assistance.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

Hi Soc23,

Unfortunately we have not received feedback from you on this topic. If you need continued support, please respond to my post.

Thanks and regards,
Babita S
#iworkforDell 

For easy access to drivers, manuals and product updates, please visit our Support Site .

put in a cd.....switch it on then off till it boots...i may take quite a few times before it boots up.....good luck

Hi Soc23,

Please check with a known good Ac adapter. If the system is not turning on even with the known good Ac adapter, I suspect the mother board is faulty. Consider replacing it.

Please click on the link below to check the warranty of the system. In case the system is under warranty, send me a private message with the system service tag to assist you further.  Please click on my name and click Start Conversation to send me a private message.

http://dell.to/12Bz4Il

In case f the system does not have warranty let me know the region you belong to provide the contact information form Out of Warranty department to get the system serviced.