Back to the stone ages...
One of the main issues with the lack of electricity is the fact that all of the worlds communications (internet, satellite, even cables) require power on both ends.
Without communications, it would be very difficult for any organization or country to begin the process of getting the power back up. With the case of the EMP, as mentioned in the comments by @XandarTheZenon, we would have very little issue. A large amount of the world's servers are reliant on the throwaway part principle. This basically means the servers have a bunch of really cheap parts that, when they begin to show wear, can be thrown away easily.
Replacing the parts that were damaged by the EMP would be easy, we basically have warehouses upon warehouses full of the parts.
But back to the major issue...
Powers out. That means that need some way to get it back up. A fair amount of this is not a big issue, as we can essentially get minor appliances up with diesel generators. Most nuclear reactors require cold start generators, which would not be damaged by the blast. Cold starting a nuclear plant isn't the easiest thing, but that's for another question.
Onto the real issue
There was a time without electricity, as you probably know. We've done this before. Most likely is that humans would form tight knit communities that would be centralized to a certain area.
Cities have lots of food: HEB, plenty of non-perishable food items http://www.heb.com
And lots of supplies: Home Depot, plenty of supplies http://www.homedepot.com
In the long term, there is no reason not to develop agriculture on a large scale, the infrastructure is there, and in all honesty, small farmers will probably be continuing on with there ordinary routine.
Long term implications
Humanities at no risk of dying out. We have food for the short-term, and most of the supplies we need. But what will everyday life look like in the long term?
Small farms producing the easiest to grow plants that yield the most calories, such as potatoes. Reasons behind this are that the amount of space we can maintain without drones and advanced satellite imaging while still having a full yield is pretty small.
Humans will have been pretty cut off by this point. Assuming getting communications networks up and running will take upwards of a decade, we will have formed small villages composed of multiples and their relatives. Each person will have to pull their own weight at the advent of this catastrophe.
There is no reason as to why automobiles that don't rely mainly on computers will not work. Any standard will function as normal. We may be much more conservative with our fuel, as it would be more difficult to acquire