RE: Dell Inspirion 3148 keyboard (left side keys like 1, Q, A, Z, Caps Lock) keys are not functioning)
Is there any damage on the system? Does an external keyboard work fine? Does the onscreen keyboard work fine? Are the keys mechanically functional?
Update the BIOS - http://dell.to/29Gz5H6- restart the system and check if the keys are working fine.
Run a custom test on the keyboard via Support Assist - http://dell.to/1NEc1Y4
Restart the system and press f12 key on startup - choose diagnostics. Let it run the diags and if you encounter any errors - make a note of the complete error and report the same to us.
If the system is under warranty, Please click my DELL-username and write me a private conversation with the service tag and your contact details(Name and Email). If there is no warranty, then you could contact our team to get a quote for a paid service call - http://dell.to/1vnT6CQ
Let us know if you have any other queries.