Dell Inspiron 3541 - No audio from speakers/headphone jack!

Hey guys,

Ive got a fairly new Dell Inspiron 3541. Ive been using an external USB recording interface occasionally when i do my recordings and now my audio on my laptop speakers have just stopped working.

Its almost like there seems to be no audio sound card recognized by the system. I have also lost my headphone jack audio output. However when I plug in the HDMI to my TV I'm able to get audio through the TV only.

Here are some screen shots:

Here's with the (HDMI) TV plugged in
Working - protrader10's library

Here's when there's no (HDMI plugged in)
HDMI Plugged out - protrader10's library

Here's another when i opened up my dictation software:
2015-01-30_2005 - protrader10's library


Any idea what's going on? Please help

Thanks in advance
Jake