Engine Repaired - Car won't start

I got a 2004 Hyundai Tiburon. The car was sold to me with a few minor problems in the engine. One bright mechanic did the mistake of wanting to flush the engine since it was so dirty, that when you tried to add oil to the engine, it would descend extremely slow. But, he never cleaned at all the engine crank and all that sediment blocked the oil pump and well, you can guess the rest.

Point is, the engine was repaired (almost all pieces that can be repaired) and looks almost new. Everything was connected again, but now the car won't start, it won't spark at all. They've supposedly checked even with a car's manual that all connections are correctly attached and their best guess, as they already checked it's not the crank sensor, that it has to be the car's computer. That either it needs to be programmed again, or it has simply gone 10/7 (both which are hard to happen to such computer), but ok. However, they haven't made arrangements yet with an electro-mechanic and I wanted a second guess. Anyone know what it might be?

P.S. Car has electricity, but it won't reach some parts of the engine where the injectors are. Etc. Ergo no spark.