Help With Fixing Computer

[YANKEEEZILLA]

I currently am trying to fix my dads old computer. It is a Dell XPS 8300, and hasnt been cleaned in forever. He told me one day he tried to boot it up and it wouldnt budge or make a sound. I then opened the case up to find an orange light lit up. Along side the orangle light, are the words aux. Does anyone know what is wrong with the computer or what the aux illuminated light indicates?

 

[N3rdR4ge]

i would imagine it is the power supply.

you can get a tester here:
http://www.amazon.com/Insten%C2%AE-24-pin-Power-Supply-Tester/dp/B005CTCD6S/ref=sr_1_1?ie=UTF8&qid=1439789017&sr=8-1&keywords=psu+test

 

[YANKEEEZILLA]

But do you know what the aux means?

 

[N3rdR4ge]

not particularly. it would depend on the motherboard. best to read the manual. i do however work on computers for a living. amber aux light usually is not a good sign and ends up pointing to power issues.