What are possible reasons for a DNA template not giving amplification?
Lets summarize the comments into a real answer: When the only chemical changed in your reaction is the DNA, which came from a fresh Phenol/Chloroform preparation, I would suspect it. From there, we have a few possibilities, what could have gone wrong.


The most likely cause of an enzymatic reaction not working with
Phenol/Chloroform prepared DNA are left-overs (or carry-over) of the
organic solvents from the reaction. The inhibit (especially Phenol)
enzymatic reactions very efficiently. It would help to do another
round of DNA precipitation.
It is possible that your DNA didn't got dissolved after the drying
step in the precipitation. Depending on the conditions, DNA can form
a pellet which is hardly to see and even harder to dissolve. So your
DNA concentration would be too low to get amplification. To prevent
this measure the concentration of your DNA.
It is possible that the water you used is contanminated with DNAses
(although it shouldn't) and your DNA got degraded by them. Here only
new aliquots will help.
Depending on the size of your amplicon, it is possible that overly
harsh condition during the preparation led to the shearing of the
DNA leaving not enough intact DNA to get a proper amplification. If
this is the case, be more gentle with the extraction.


Additionally your primers can be a problem. It would be good to keep the 100x stock solutions permanently at -20°C and prepare 10x working solutions. These can undergo freezing and thawing (which will degrade them over time) but they can be replaced easily.
I would also try the new DNA prep (if possible side by side with one that is working) with new primers to test if they are the problem.